First time I booted up I "wiped" the hard drive and freshly installed Lion (which, by the way, I paid for, and Apple refused to support). I knew it was used. Used is ok; remote wiping my data is not. Turns out though, the wipe didn't really wipe like a Unix newfs would, because I found the old owners contact data when I used a disk recovery utility to recover the data destroyed by the remote wipe. When I contacted him (because I was concerned the laptop may have been "hot", he proved he legitimately sold it, and said he did not initiate the wipe, even though the Genius bar said the serial number was registered to a last name matching the contact data I found on the drive. Any more assumptions?
So it's been all security theatre, and no actual security, for those following at home.