clipped from: gizmodo.com   
Our comprehensive smartphone guide lacked one key feature: NES emulation. An important trait, to be sure, and one that the Palm Pre, after a bit of fiddling, now possesses.

As mentioned above, the "fiddling" actually requires you to gain root access to the Pre. This important step is followed by compiling FCEUltra and an adjustment or two to the display settings so that the NES games run at a somewhat squished 320x480.

Understand Linux better than breathing? Great. Should be easy then. Full instructions in the Pre Dev Wiki link. [Pre Dev Wiki via CrunchGear]