2-way photo sharing sites?

i am trying to find a way for a client to simply have a 2 way photo sharing site, and by that i mean we can post photos and have others also post photos all on the same site. i am basically looking for something like flickr but where both the client and others can post photos to the same place/page.

i know that yahoo or google groups does this to a point but they are very cluttered and not really going to work for us.

i feel like this is something obvious and available but i am failing to find it via google. any ideas?

 

thanks all - mobileme might be the ticket.