Well the Pro-Mini from Magic-Pro Computer could be used, it is small (a bit longer and less wide than the Caanoo itself), it is wireless but uses a USB receiver instead of Bluetooth (the Caanoo has a USB host), and it works with Linux (the Caanoo runs on a Linux based OS) so I'm guessing it might alredy work or could easily be fixed to pair with the Caanoo, now it's up to someone to test it, the only problem is it is 70 bucks (from ThinkGeek).