I'm one of those who decided to get the catalog and since for sure there's people wondering if there will be something they like on the lottery i offer myself to answer questions that are cel related of what's on the catalog and their fixed price. Of course i don't know all the series and/or characters but i'm sure that with the help of other people that have also purchased the catalog we can barely give you info (the catalog is in japanese only and i don't know a bit of japanese). Also please don't ask for scans (at least from me, as my right arm is broken, yes, literally, so i can't be doing scans right now, just type with my left hand

As for some introduction, the info/preview page of zenbu 24 is here (as posted in other thread)
http://www.mandarake.co.jp/english/publish/zenbu_24/
Here's some info about cels from series that i recognize and that i consider popular:
Ah My Goddess: 4 cels, and some reproductions. From the info page, the one on the left is a reproduction if i'm not mistaken.
Card Captor Sakura: 6 cels. Nothing specially different from what you can ussually find on Yahoo Japan or other Mandarake auctions.
Nadesico: 3 cels. One Yurika. No ruri.
KOR: 6 cels. (I'm going for some of these so plz restrain yourselves from ordering them ^__^)
Evangelion: 3 cels and a few reproductions. 2 of them are on the preview page, but the one on the left is a reproduction.
Slayers: Only cel as far as i can see. The xellos featured on the preview page.
To Heart: 8 cels. The best ones are on the preview page.
Noir: 2 cels, 1 Kirika (on the preview page) and one really nice Chloe
Sailormoon: 4 cels, nothing really worth imo.
Maison Ikokku: 3 cels
Ranma: 12 cels
Rurouni Kenshin: Just the Aoshi that is featured on the preview page.
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Don't see any cel of Inu Yasha, Dragon Ball......
For those interested in sketches i haven't seen any from popular series like Naruto of FMA, well to be precise i have only seen sketches from what seem to be many old shows