Live Mesh
Microsoft last night took the wraps off of Live Mesh.
What is Live Mesh, you say? Something bigger than I can describe effectively at this point.
I would seriously consider taking a careful look at this video on On10.net.
Basically, imagine all your files and information synchronized with all of your devices, shared with whomever you want, whenever you want, with nice listings of what has been going on in your mesh.
Oh, and did I mention that its a platform for other software to build on top of, not just a piece of software? Sweet.
I want more info!