After you register (it’s free and easy to do so) at DropEvent and create an “event,” anyone can upload photos to the identified url address, and they can even email them there.
These kinds of sites are great for students to use for uploading photos from field trips or other events.
I’m adding DropEvent to The Best Web Applications That Lets Multiple People Upload Their Photos To One Place.
The best part about DropEvent is it gives you an email address that your friends can use to upload photos to the same album. It’s nice that it’s not limited to those that register. Site’s still pretty new though.