When Apple killed Atom processor support in the Snow Leopard 10.6.2 update, it was one of the first times they'd actively tried to stop hobbyist hackintoshing. It was also sort of a dick move! Luckily, it's not going to stick.
The (main) man behind the NetbookInstaller software, which takes care of enough of the under-the-hood tweaks to make netbook hackintoshing approachable, heard the plaintive cries of his flock, and handed down a decree from on high:
The kernel will be fixed. It'll just take a few weeks.
This certainty, combined with the flip-flopping Atom compatibility in earlier 10.6.2 builds, points to the breakage as an intentional choice, not just some incidental bug. Update: Actually, there's an interesting case to be made the 10.6.2 killed Atom in all builds of the update. Interesting. —Thanks, Eduardo!
Even better, for anyone who dove straight into the 10.6.2 update only to find themselves very suddenly without a working netbook, there's a quick fix: Downgrade your kernel! Using the same instruction set you can do a partial (excluding the kernel) upgrade to 10.6.2, but you're probably just best off waiting until everything is patched up right and proper. [Meklort, MyDellMini]