in android? there is but it's really flakey, even on the zaurus where people have been putting a lot of effort into making android run correctly. I predict we'll see a flurry of activity around android when Google releases the rest of the source.
I'm using the Apple Bluetooth kbrd (A1255 not the big one) on my N800. Pairing was cantankerous but after that it works great. The keyboard is small but just large enough to touch type on. Looking forward to Android.