Motorola RAZR V3i / V3t / V3e / V3r
unlocked 3vi
The V3 line is pretty easy to update, modify and hack.
There is a wealth of information at the following two sites (including the s/w tools you need to do the work)
http://www.motomodders.net/ »
http://www.planetmotox.net/ »
good luck! :^)