Depends what you want - a preformatted image hosting site or your own space?
I use Dreamhost
http://www.dreamhost.com
My webhosting package is $110 per year. For that I get 1 domain registration fee included, 450GB + unlimited server space, option to register multiple domains at $10 per year ea, I can authorize multiple users etc etc. I find it particularly useful when working on projects with large videos with collaborators. I can create an ftp archive that we can both access where we can upload / download very large video files.
Joe Cali