This isn't really rated in order of which one I 
like the best ^_^; it's more just that I visit 
these all the time:

Keys' Gallery
http://www.fukushuu.com/
She has such good taste in cels :) I just love 
visiting Raiel-chan and Wolfwood-sama!!!

Ryouko's Gallery
http://www.sailorv.com/
I love the domain name for one (sailor-v forever 
^_^!!) plus I am a big fan of her Tamahome, 
Tasuki, and Raiel cels ^___^!

ISL's Gallery
http://earth2star.org/islux/
Who doesn't drool over ISL's cels? They are truly 
amazing O___o.

Asylum Cel Gallery and Cellery's Gallery
These links are private, but the cels are 
~droolage~

Ms_Poe's Gallery
http://tbns.net/tokyoanime2/
Most of the series she collects I don't like, 
most I haven't even watched (and probably never 
will ^_^). But she has VERY good taste in cels, 
the cels she picks have vibrancy and life. They 
are really stunning and worth checking out.

Deb's Cel Gallery
http://www.jersey.net/~dnilsen/cels/
Gorgeous site design, amazing cels.

Luna Regina's Cel Gallery
http://www.lunaregina.com/
Small collection, but very nice :)

Yann's Gallery
http://www.animanga.com/cels/gallery/
Though I usually start weeping, so I have to 
leave. God I want your Shamanic cels *whimper*

Luna Illuminata:
http://lunacels.tripod.com/
Very nice SM cels.

Atiya's Gallery
http://www.marmosets.net/
Cute cute cute critter cels. You need to put up 
more cels ;_;

Nancy's Cel Gallery
http://www.womshop.com/home.htm
Droolage ^_^

That's it :) I hope you enjoy visiting those 
sites too ^___^! There are a lot of other great 
galleries out there >.< hope I didn't forget 
anyone O___o

-m