With the BlueMaemo application can turn your Nokia N900 in a remote controller for the PlayStation 3 by means of its Bluetooth. In addition you can also use your terminal as a mouse, keyboard or a remote control multimedia.
By now this application is in a state alpha and can do with the PS3 is to introduce text or navigate through the menu. But it is sure that in future versions will allow use the N900 as a command of the console to play much more complete now 
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[youtube]http://www.youtube.com/watch?v=huzCCdMH5SY[/youtube]
wow! that is really clever.
This works really fine on my N900. cool.
Its not working on OSX 10.6.7 and N900.
Actually, it get connected, I can see dashboard, but after a second or two it disconnect.
Any ideas?