Another cool app soon to come to Android is Dropbox. You install it on your computer (or iPhone) and it works like any other folder on your hard drive, however when files are placed in it, it is backed up online. You can have it installed on multiple computers and it will auto-update any changes made to others. You can also access everything online without have to install. Great for me and schoolwork that I do on my laptop traverses to my desktop automatically. And in case I forget an assignment or presentation, I have access to it from anywhere. It has many other features.
http://www.dropbox.com/
Here is a note in their most recent email:
Do you own a Blackberry or Android phone? Don't worry! We've got plenty more mobile magic coming soon!
Happy syncing!
-The Dropbox Team