I just bought a Cygnett Bluetooth keyboard for $29.95 at Frys Electronics today that pairedd perfectly with my SGT (T-Mo) and works perfectly well.
I dont see any reason why it would not work with all SGT's.
The thing I like most is it is small enough to fit in the Pelican case that I have for my SGT. I just cut the foam in half, removed the foam for the keyboard and now have a 2 layer foam cushion for the keyboard and SGT.
Waiting patiently for CM7
T-Mo Samsung Galaxy Tab