XPostFacto: Run OS X on your older machines
[onethingwell](http://onethingwell.org/post/27051972695/xpostfacto:
"Apple has chosen to limit the machines which are supported by Mac OS X, but XPostFacto can help get Mac OS X working on some older machines.”
Via Egg Freckles enconium to the ‘Wallstreet’ Powerbook.