I have been using now for some time software called Dropbox to keep my various workstations, servers and laptops in sync, and to share some content with colleagues. The system works surprisingly well, and is totally silent and quick, just doing the file synchronization job fast and invisibly in the background.
The free account has 2GB limit, so this is only for keeping the files from the most recent projects up to date. Some materials still need to be backed up manually. Most importantly, this is not yet the tool I need for keeping my music as well as the photo and video albums backed up. There must be a reliable, fast and quiet real-time synchronizing tool somewhere, I just have not yet found it.
One of the benefits of Dropbox service is that they support different OSes, so I can finally have my Linux laptop all the time synced with my Windows boxes. For the photo and video file masses I do not need such cross-OS compatibility, I only need to keep Vista, Win7 and Windows Server 2008 in sync there.