I always put aside some of the nicer or more interesting scans and make smaller versions to put on my RS home page in the left column as "New Arrivals." And out of habit I've saved both HTML and IMG links to these "wallet-sized" scans. For a couple of years the IMG links have gone unused -- but dang it, I figured I'd do one more survey and comment on an update, if only for the sake of newcomers.
As typical of updates for the past 5 years or so, the new items are overwhelmingly sketches from CGI-era series that I have been following. But I've gotten a taste for pre-1990 "Golden Age" cels, and so the plastic part of my update is usually heavy on these. Many American collectors might recognize the first two of these:

Blinky

Pinky
These are the koala protagonists of a 1984 series titled Fushigi na Koala Blinky that celebrated the arrival of the first animals of this species to Japanese zoos. The event caused nationwide publicity that led to this series, produced by Nippon Animation and another, Koala Boy Kokki, done by Topcraft. Both series were licensed by Saban International and widely distributed in various dubs. American GenXers know them as Noozles and Adventures of the Little Koala.
This set was interesting because the cels had been chosen by the studio to sell as souvenirs. They came in a yellow-paper frame with Nippon's logo on the front, the cel (sigh!) attached to a trimmed down original background with adhesive tape and the whole affair bonded together with circular metal rings. They stunk to high heaven of mildew, but once I'd deconstructed the "frame," aired everything out, and given the cels a bath to remove decades of dust, I found that they were actually in pretty good shape. Each had notes on the top, giving their original contexts by episode and cut, but (having only access to the Saban dub, edited down to make room for more commercials) I could not locate either image. Still, they are fine additions to my collection, as Blinky/Noozles cels are very hard to find.
The next new cel is one that I'd expect no one to recognize:

Wata no Kuni Hoshi: Chibi-Neko is left out with the trash
This comes from a 1984 film produced by Mushi Production (hand-inked trace lines!) based on a manga that was at the time very popular, concerning the adventures of a kitten who (having been raised away from her mother by neglectful students) believes she is a human being in some kind of larval form and will eventually transform into the same shape as the hunky guy who has adopted her. It's totally unknown in North America, though there is a decent fansub that's easy to find, and, so far as I know, I'm the only person who's made it a mission to collect cels from this project. This one comes from the cold opening of the film, showing the poor kitten (depicted as she imagines herself, as a toddler with cat ears) as she vainly begs for some food beside the trash cans where she's been abandoned.
The next cel might ring bells in some people's heads, as it is from a more familiar "Classic Cel-based Series":

Mira’s Companions
That came up randomly in a set that included some sketches and a timing sheet from a now-scattered cut near the end of the final episode (#49) of Magic Knight Rayearth. As I have a gallery devoted to this series-ending adventure, I thought it worth snagging for the sketches. But I was intrigued by this sketch, which is just the bottom layer for a moving set that shows Mira, the bold little tyke who realizes that the Magic Knights function through the power of the Cephironians' faith in them, along with two other supporters. But this back layer just shows the people that (in Milton's words) "also serve who only stand and wait."
Another remnant lot preserved a nice rough sketch from Ep. 46:

MKR: Eagle Vision (Rough by Shinobu Nishioka)
Nishioka did a lot of the animation direction for the Rayearth OAV and was character designer for Devilman Lady and Yumeria.
The sketches included some interesting items from the 2001 Studio Deen anime adaptation of the classic manga Fruits Basket. Sketch sets from this series also didn't fare well: some were broken up and sold douga-by-douga to Takaya-sensei's many fans. But the remnants of these sketch sets sometimes contain very interesting items, particularly the roughs and gengas. The current update includes:

Fruits Basket: Tohru learns Kyo is The Cat (Ep. 2)
(That came with no identification, but I could see that the rough was done in a style similar to the animation director for Ep. 6. The same artist did Ep. 2, so I looked up that installment, found that Tohru wore the outfit in the sketch in the opening scene, and kept watching until it turned up.)

Fruits Basket: Piglet Kagura karate-kicks Kyo (Ep. 4)
(That batch was complete enough to make an enjoyably hard-hitting reanimation.)

Fruits Basket: Tohru with Arisa and Saki (Ep. 6)

Fruits Basket: Shocked Kyo (Ep. 6) (Shigure has just confessed to Tohru and her friends that he makes his living by writing soft pornography novels.)
Another set of newcomers represent the very fine first season of Rozen Maiden done by Studio Nomad in 2004, with Kumi Ishii as chief animation director. This artist did a lot of work revising and at times replacing his episode animation directors' work. This full shuusei shows her real power at making flat sketches look fully three dimensional:

Rozen Maiden: Shinku in a coma (Ep. 7).
And as I've collected from this series, I've found that one of Ishii's most talented junior animation directors was Kimiko Tamai. I've found that her roughs are anything but rough: they are exquisite in their detail and in their energy. And yet Ishii regularly reworked them, often in important details, sometimes totally. This tension between two very fine artists, I suspect, is why the three episodes on which they worked together are artistically the finest in that series. And so, with a run of new sketches from the climax of this episode in hand, I could justify pulling together a new gallery from the Ep. 11 Tamai/Ishii sketchwork:

Rozen Maiden: Suigintou terminates the match with Shinku (Ep. 11)

Shinku spread-eagled in Suigintou’s grip (Ep. 11)

Suigintou triumphant (Ep. 11)

Shinku realizes she’s injured (Ep. 11)
Finally, there was another addition of work from the 2006 J. C. Staff production of Asatte no Houkou, oddly released here as Living for the Day after Tomorrow. That is a wonderfully narrated 12-episode story with art supervised by Ikuko Itou and Shinya Hasegawa, two major forces in classic/modern anime. Some of the new pieces just complemented or filled out scenes I already had sketches from, but these were the most dramatic:

Asatte no Houkou: Tetsu refuses to recognize Karada (Ep. 11)
(Don't have time to give a full explanation, but the Tetsu/Karada affair is the focus of the plot, which runs awry as romance is prone to do because Karada, a prepubescent little girl switches ages with a sexually mature woman.)

Asatte no Houkou: Karada panics (Ep. 12)
(She spends a lot of time running frantically in the series, and the animators manage to capture this in animation that is often very quirky and unexpected.)

Asatte no Houkou: Tetsu gets ready to confess to Karada (Ep. 12)
(Oh, and you have GOT to have a moment when the guy finally "gets it" and does a big "I ... I ... [dang it all ...] I love you!!!" moment. That was fun to reanimate also, even if the confession itself is put in a long shot from the side that breaks up the douga set in the middle.

Asatte no Houkou: Shouko-chan says good-bye to Kotomi (Ep. 12)
One of my favorite moments: Shouko, the older-woman-grown-a-kid-again develops an oddball relationship with Kotomi a minor character who always seems to be there at the precise moment when the plot needs to be kicked ahead. And at the end, Kotomi plays a little trick on the rejuvenated tyke, says goodbye, and boards a train for home. And ... what she does resolves the series plot in an unexpected, but perfect way. (Noooo, I won't explain. You need to watch the series. All the way from Ep. 1 to Ep. 12. More than once.)
Enjoy!