I found these keyboards, very affordable and very small!
This one is very very very small, but USB, very nice IMHO and very cheap!... http://usb.brando.com.hk/prod_detail.php?prod_id=00666

The same people sell an RF version with joystick (great for CarPC or Multimedia PC's) http://usb.brando.com.hk/prod_detail.php?prod_id=00678

And here is an illuminated one (no joystick, like first tiny USB but wireless) http://usb.brando.com.hk/prod_detail.php?prod_id=00753