Im on a 3g 2.0.2 and just downloaded KeyVib1.0

Tacticle vibrations for keyboard feedback, so far so good it works as advertised.

With 2.0.2, as far as I know, you cannot "turn off" keyboard sounds in settings and have the vibrations only. It will turn off the vibrations and the sounds alltogether.

I got around this by creating a 0.5sec "silent" sound with ToneFX Creator and inserted that as my keyboard sound.

There might be a quicker way but it works well....