Yep, we knew this would happen. Apple, for whatever reason (they didn't test it and don't care or they are trying to prevent Hackintosh) killed support for Atom in their latest 10.6.2 build.
All of you cheap bastard Hackintoshers can rest easy though. A Russian hacker was able to slap an old Atom-supporting OSX Kernel on the newer Mac OS 10.6.2 build and get it running on his little Atom netbook. Depending on how much Apple cares, we'll probably see this shut down in 10.6.3. Rinse. Repeat.