OK, one cool app for a NIT I really love is BlueMaemo.
This app lets you control your PC or PS3 as a bluetooth HID device.
It has different profiles for mouse, keyboard, PowerPoint, media, gamepad & PS3!!!

At the time it is available for OS2007 (Maemo3) & OS2008 (Maemo4) but it will be released for Maemo 5.

Link for the app: http://maemo.org/downloads/product/OS2008/bluemaemo/