Application Title: PictureOfWhat
by Eeyore

"PictureOfWhat is a game of mystery pictures with interactivity powered by AIM. You are shown photographs of curious animals, people, places, and things. The game is both simple and hard: try to figure out what the heck you're looking at! Then tell other users what you thought about the picture or the answers. Anyone can play, but only AIM users who log in to the integrated Web AIM interface can post comments."

URL: http://pictureofwhat.com/

Plugin Title: Album Share
by amiune

"The AlbumShare plugin allows you to share a photo album with your friends. You don't need to worry about resizing each photo or uploading one by one. Just choose the folder and you and your friends will be seeing the same photo at the same time so you can tell them about it."

Download the plugin here.

UPDATE 5/6: now both user can interact switching the photos, and they can rotate, flip, and save each image.