OpenMoko
Difference

Difference from other Linux phones
'others' discourage third parties from writing apps
you need explicit permission? WTF!
'others' try to make customers pay for a device that's still under manufacturer / GSM operator control
'others' use proprietary kernel modules
locks you into some old kernel version
'others' use proprietary bootloaders
'others' dont give you JTAG/serial access
'others' use proprietary UI toolkits
vendor lock-in
'others' dont give out their build system
'others' dont give out their firmware update tools