If you travel a lot, need to work on a collaborative project, or are trying to live a "paper-free" life, then here are two websites for you!
Use these sites to create faux Word, PowerPoint, and Excel documents...
http://docs.google.com - you can share documents with other people, track editting, and even save the documents to your desktop as the appropriate Microsoft file. It's magic!
and
http://www.zoho.com/
Zoho offers an even broader array of products, including web conferencing and a planner function.
Yeah for online productivity!