There are a few really nice ones available.
No one has a huge collection as the cels are 
expensive and very hard to come by

Atiya has a lovely gallery at:
http://www.its.caltech.edu/~atiya/celgallery.html

Key's is at:
http://www.its.caltech.edu/~isaacs/cels.html

Melissa's Gallery 
http://www.geocities.com/Tokyo/Pagoda/2815/

The list of galleries will give you another good 
starting point. Yeah and I have a small one as 
well.