I am not sure about all the details of these sites. Some appear to be free, some ask for a paid membership. All of them seem to allow unlimited storage, but don't quote me on that. At any rate they are worth checking into to find out the specifics.

http://www.imagestation.com/

http://photostorage.net/

http://www.fotki.com

http://www.dotphoto.com

http://www.shutterfly.com

Hope this helps :-)