Yeah, this tends to happen.  That's one of the 
reasons that I started putting my site logo over 
my cel scans.  It doesn't completely solve the 
problem (people can still crop your image), but 
it helps.  Check out the link below--it's got 
some of the images stolen from my site, but still 
with the logo on it! (and Jennifer, some of your 
cels ARE on this site =P)

http://www.knvegeta.com/cels10.shtml

It's annoying that these guys think they have 
what one claims to be "2nd largest cel gallery on 
the net," but what can you do?  There are a lot 
of idiots out there =P

Oh well.  I do recommend that people who don't 
have their images marked do so as soon as you can 
(unless it doesn't bother you of course).  For 
me, it's not so much a big deal...just a small 
annoyance.  I do enjoying laughing at some of the 
idiotic stuff they put on those sites though ^_^  
Do these people even watch Dragon Ball?!?

-Graham