I think there's been at least 3 of these threads in the last day, but I guess one more won't hurt.
Check my site:
http://sponsorhostedgalleries.com
Just check the table on the main page for the sponsors that have a "yes" in the movie galleries column.
There's a shitload of them, and you can see the galleries for yourself right on my site before you waste time signing up for the sponsor.