Get Dropbox invites here
From Webware:
Dropbox is a promising new tool for online storage, file sync, and sharing. The cross-platform system plug-in gives you a shared drop box where you can dump files and access them from multiple computers just like you would on the home machine. It also keeps track of any changes to the files, which can be rolled back to previous versions that have been archived on the service’s cloud storage.
I am using this service to sync files across my MacBook Pro and office Windows desktop seemlessly. It uses port 443 for communication so it is secure and works through the office firewall.
If you want an invite for this beta service, please leave your name and email id in the comments.