This is a method done through your recovery that is already available. The two bugs that were reported initially have been fixed up; voice input is also working correctly now. If you want to try it out, download it here and flash it. These are the list of confirmed ROMS the keyboard works on.
Only two days after the release of the Droid 2, its multi-touch keyboard has already been ported to other devices, first the Droid Incredible and now the Droid, Nexus One, EVO, and Desire, though they only work on certain ROMs.