
iWork.com is currently in "Beta" stage, and its purpose is to allow iWork users to share and collaborate on documents in multiple formats, being accessible right from within the iWork application.
The most interesting part is that you can easily export documents straight to Google Documents, and then work on them from the Web, leaving aside restrictions related to the OS you're using and your location. Sweet!
As usual, the sad news arrive in the end - while the "Beta" is currently available for free, and you can access it from iWork '09, as I mentioned above, iWork.com will become part of a paid service later this year, when Apple expects it to go live...