1. Drop.io: Drop.io is like an electronic in-box. Set up a drop and your students can hand in their papers and projects electronically. It is also a great way to share documents and media with a group. Drop.io describes itself this way: "Drop.io enables you to create simple private exchange points called "drops." The service has no email signup and no "accounts." Each drop is private, and only as accessible as you choose to deliberately make it. Create multiple drops, add any type of media, and share or subscribe as you want." I've embedded a drop.io box on the right column of my blog. (It is working now.)
2. Blabberize: Press play, it speaks for itself. This was easy to create and you can try it out without signing up. If you sign up you can make the picture private, so that it only appears where you put it.