File Sharing & Online Storage -available for Windows, Mac and Linux.
You can read it or watch their screencast for all the information.
https://www.getdropbox.com/What exactly is Dropbox?
Dropbox is the easiest way to share and store your files online.
Works like you do
No complicated interfaces to learn. Dropbox runs in the background on your desktop.
Worry-free syncing
Sync your files automatically to your computers and the web.
It's everywhere you are
Sign in and access your files from any browser or mobile device.
Easy sharing
Sharing files with your friends and family is just two clicks away.
Photos
View your photos in a gallery and share them easily with anyone.
Dropbox works just like any other folder on your computer, but with a few differences.
Here's how it works:
* Drag and drop to move files around, just like you normally would
* Any files or folders inside Dropbox will get synchronized to Dropbox's servers and any other computer linked to your account.
* Green checkmarks will appear on top of your files to let you know that they're synced and up to date...