About a week ago I installed Dropbox, and I have to recommend it to anybody who needs to sync their files between machines. I have a group of Macs that I use to sync data between, and I used to use iDisk, but Dropbox is so much quicker that I can’t see myself using iDisk anymore. Also, the syncing between Linux and Mac OS X works great – I haven’t got a chance to test the Windows client yet, but I’m sure it works just as good.
If you sign up with this link, you’ll get an extra 256MB, and so will I.