The free CHIRP programming software supports the Kenwood but not the Yaesu at this point.
http://chirp.danplanet.com/projects/chirp/wiki/Home
CHIRP is great for the Kenwood, Baofeng, and SOME Yaesu units. However, the Yaesu software is very good on its own, so I would stick with that.
The Kenwood software is pretty crappy and the Baofeng is impossible to program without something.
There is a good amount of user support for both the Kenwood units and the Baofeng units. Both have their own Yahoo mail list.