According to this announcement, a Linux client for Dropbox should be coming out in a week or so:
I’ve been using Dropbox for several months, and it’s really, really great.
What is it? Watch this video:
It’s backup and auto-syncing done REALLY well. Best of all, you can sync between more than one computer, even if one is owned by someone else. So I could create a folder then share it with Robert. It shows up on his machine. If either of us changes files in the folder, those changes are auto-synced with each other.
So check it out when you get a chance. 2 GB are free. After that, you pay a small fee.