Funimation has gone after sites before for just 
about anything related to DBZ, including 
videogame mods.  I believe their license does 
include 'distinctive likenesses', so they could 
go after a site like the one mentioned in this 
thread.  Just fire off some e-mails to Funimation 
and see what they say.

The site mentioned before also updated their 
front page regarding people asking to remove cels 
and about getting a 'new' provider.  It does seem 
like an endless cycle reporting each site as they 
find a new provider, but there's only so many 
places that can host a site with a lot of 
graphics like that.  Ah well, best of luck to you.
(my DBZ cels have made it up there. . .this is 
why I decided to watermark my cels several months 
ago, although removing watermarks also seems to 
be a hobby of these people)