I started collecting ~1 year ago. I was on yahoo japan for non-cel reasons (Wonder Project J2, an awesome japan-only N64 game), and wondered what kind of japan-exclusive merchandise was available for Laputa: Castle In the Sky...
Suffice to say the fire nation attacked and I got into cels at that point, and started looking up other series. Most series I had seen were digital...however, I found certain characters (no clue what show they were from) stood out. I love character design and analysis, so I tended to buy (cheap-ish) cels with really interesting characters; Kinda backwards, but suffice to say I now have much more anime to watch

Some stuff I like:
Magic Knight Rayearth
Kaitou Saint Tail
Now and then, here and there
Slayers
Serial Experiments Lain (no cels yet though

Higurashi no naku koro ni (Still has sketches!)
Satoshi Kon's Everything (Haven't seen Paranoia Agent; need to though)
TRON (TRON 2.0 is my favorite; if PC games had cels...)
Don't really have a gallery yet; I tend not to post too much stuff to the interwebs...
And as my Username suggests, I'm big on ancient DOS games (Space Quest, Jill of the Jungle, etc). and TRON, as well as writing software. Anywho...Hi!