Pretty cool and helpful because two or more people can be working on a project at the same time from each other's house using their own computer. Then you can email the document to your teacher right from there !

use an image and make it look as if it is talking, by recording your own voice! Useful because it is almost always hilarious to see a talking llama talk to you about something something a llama would never say!

http://www.skype.com/intl/en-us/home
http://docs.lancastercountryday.org

Skype- 2.0 because you can interact with another person by using text or by using video/webcam at the same time.
Gmail- 2.0 because it shows ads relevant to your emails. Has google docs, allowing one or more people to view and edit a document at the same time. Also has video chat.