The key goals of The Commons on Flickr are to firstly show you hidden treasures in the world's public photography archives, and secondly to show how your input and knowledge can help make these collections even richer.
Picnik makes your photos fabulous with easy to use yet powerful editing tools. Tweak to your heart's content, then get creative with oodles of effects, fonts, shapes, and frames.
Shwup is a great site for teachers and students to use in order to post and share pictures and videos on the web. You do need to sign up, but anyone who gets a log-in can be invited to share in creating a "muvee" with the images that their "friends" (classmates/colleagues) are sharing. This is a great way to do collaborative multimedia projects or keep pictures and videos in one place from an event that had more than one person taking footage/images. The videos can all be shareed on shwup and posted to blogs, Facebook and other social media sites. Fun, easy to operate, and very useful.