I've been using an interesting combo of input devices lately. Namely,
Art Lebedev Studio's
Optimus mini three keyboard (left) and
I-ROCKS'
KR-6600 'nano slim' keyboard. The two keyboards are relatively unique in that the mini three is the first keyboard to implement OLED displays for the keys, and that the KR-6600 is probably the smallest 'full set' keyboard you'll find on the market. It's barely bigger than the Half Keyboard I used for my wearable computer back in the old days.