I've laser etched more laptops than most since I help operate the Instructables laser cutter at Maker Faire and the Web 2.0 Expo, however I've never actually etched any of my own computers.
I decided to put my old PowerBook G4 under the laser for a slightly more experimental and complex etch than I've previously done. Luckily, the technique worked, the etching went off without a hitch, and the computer came out of the ordeal completely unharmed.
Typing on top of your own hands is a little freaky, but I'm definitely enjoying it, and so far, it's prevented any writers block because I'm always ready to type!
Step 1: Photograph hands and computer keyboard
I set a camera up on a tripod and took photos with my hands in place over some white paper so that the image would be easier to trace in Photoshop.
I then took the paper background away and took some photos of just my computer keyboard so that I'd have something to register my hands on.