Sean Mcneil and a bunch of other guys are currently porting Android over to the Neo Freerunner. You need to have a SD card inserted on the Neo in order to boot Android, the card must have a FAT and a EXT3 partition.
Grab the kernel image and roots at http://people.openmoko.org/sean_mcneil/
AEP-Emu (DE/EN)
DMG Page (DE)
EmuBit.pl (PL)
HomebrewWelt (DE)
Indie Retro News (EN)
NintendoMax (FR)
PlayerAdvance (FR)
Retroguru (EN)