Well, actually, if you send your cels to a real 
animation gallery that has experience in framing  
animation cels, it can be a good thing.  Its hard 
to find places that do this though.  You need to 
have real pros do it in order to get it done 
right, never go to just a poster gallery or 
something.  Ive posted these people's addy many 
times,and they are simply the best.  They deal in 
nothing but high end animation art: Disney, 
Bluth, Warner, Fox, you name it.  They do in-
house custom framing, and they are just 
fabulously done.  If anyone ever has framing 
questions, or would like to have cels framed, I 
highly reccomend these people:

Fine Toon Animation Gallery, Houston, Texas
http://www.finetoon.com/

Hmm, their site seems to be down tonight, 
hopefully they're still alive :).  Please try 
them though if you any questions.  I need to 
start a cel framing chain, I live a stone's throw 
from Houston, so Id be happy to get stuff framed 
for people :).