Hack Brings Mac OS X to the Nokia N900 - PCWorld

"Finnish geek Toni Nikkanen has become the first person to successfully run Mac OS X--in this case, Mac OS X 10.3 "Panther" (released in 2003)--on a cell phone. The phone he managed to achieve this feat with - Nokia's N900 smartphone. Sadly the hack, which makes use of PowerPC emulator Pear PC, runs incredibly slowly."