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I've been using Live Mesh for about 3 months now in various forms of Beta, and its worthy of a mention. If you work in various locations on various machines, they could be Apple or Microsoft OS's, also blackberry's and smartphone's. The "MESH" cloud enabled you to store documents and files in the ether, choosing which folders to sync up with which machine. You simply sign up (with your live ID) and install a client.
Also is the facility to remote control any of your machines from any of the other machines in your "MESH". The nice use of the RC client is you can choose if you want the remote desktop scaled to your local size, or switch to 1:1. Also cut-n-paste is supported, and no amount of desktop resizing seems to put if off.