Letting users upload photos without logging in or register.

I'm looking for a plugin or a way to let users share photos with us. But I do not want them to register or login (unless they want of course).
I haven't found such plugin, but I'm positive there must be one :smiley:

It would be very nice if an automatic gallery was made with the user posts. So moderation is needed. Well I you do know this kind of plugins, I'd appreciate a lot any orientation to get it!

Have a nice day!