Not sure if this has been posted yet, but the guy with the website "http://thisguyhasmymacbook.tumblr.com/" got his Macbook back thanks to posting the pix of the alleged thief. Using the app Hidden, his Macbook took pix of the crook and sent them to the owner somehow.
Update: (May 31, 7:38 PM PST) Thanks to the power of the Internet, I have the attention of the Oakland Police, who are tracking this guy down RIGHT NOW! Follow @jmk on Twitter for updates!
Update: (May 31, 8:37 PM PST) ARRESTED! An Oakland police officer just called me to let me know that they arrested the guy in my photos! BOOYA! The police used my evidence (email which pointed to a cab service) that he was a driver and tricked him into picking them up. Nice work OPD!
Update: (June 1, 11:32 AM PST) The Oakland Police acquired my MacBook last night, and I picked it up this morning!