Migration Assistant rocks
I recently bought a second hand Macbook Pro (the machine I should have bought in the first place but couldn't afford) and wanted to move my files from my Macbook to the new machine.*
If I were a PC (nothing against them I own a few) then I'd have been locating files copying them across the network, reinstalling applications and activating them
But no, I'm mostly a Mac these days and so all I had to do was start Migration assistant on both machines, tell one about the other and go to bed. In the morning Macbook Pro had all of my documents and wait for it applications too. Admittedly some of those applications needed activating afterward but my new Mac looked a lot like the old one only faster and backlit at night 
How cool is Migration Assistant?
"Cool as der cucumber, Johnny" - Wulf (Strontium Dog)
Wonder if Windows 7 has anything like it, if not maybe Windows 8 will be my idea
* Not sure if the seller would want to be publicly identified but both of them are fantastic people
