I made the JointSpace implementation for the N900 (http://jstx.sourceforge.net, as referenced above) - shouldn't be too difficult to port, but only works on Philips Smart TV. Didn't make an official installer though, just download and run (from commandline). Feel free to process into something useful for your purpose, but my intention was much more domotica-like (showing a notification on-screen, a crontab to e.g. change channels etc).

Sander