The Cyanogen team was able to get CyanogenMod v6.1 booting on the T-Mobile G2 today! Although this isn't a permeant solution, it just shows the progress is going well.

Basically what Iím doing is temprooting and rebooting all of userspace with CM on the sdcard. Gonna keep refining it while the really persistent and smart guys from #g2root keep working on a permanent root.

Source: T-Mobile HTC G2, Meet CyanogenMod: Video Of CM6.1 Booting On Cyanogen’s G2 | Android News, Reviews, Applications, Games, Phones, Devices, Tips, Mods, Videos, Podcasts - Android Police