Blabberize is a fun 2.0 tool that allows you to record your voice with a static photo. Besides, they use a llama on their home page to demonstrate how it's used. What's not to love about that?
I could see a student using this to create an audio story for a classroom exercise. It's pretty ridiculous, but I imagine that's the appeal of it. It looks so simple that it would be a shame to not try it out! And I'm not aware of anything like it, except for JibJab, but that's much more limited in what you can do with it. I just am surprised that the Llama's audio is so poor...
Dropbox has been a life saver for me with my 8th grade science kids. We do a weather photo project and they must digitally send it to me. Well, the photo projects are usually too large for email so Dropbox to the rescue. This product is one that both teacher and students can use. Perfect for collaboration as others can edit what you share with them. A similar product would be Google Drive.
TeacherTube is similar to YouTube, except the videos on here are meant to be shared with students, where on YouTube that isn't always the case. There are videos, photos, and even groups to join.
This would be great for formative assessment. You create a wall on which students can post "sticky notes" to add to discussion, answer a question, ask questions, etc.