Thanks Jeffus. I recently found the shutdown option in root mode. That will do it for now. Although it would be great if there were a gui. Unfortunately I'm not able to build one myself.
Since I like listening to radio streams when i go to bed, it would be very useful to have a timer application that can shut down certain applications or the whole device. Even more usefull would be...
You can use last.fm via the lastfmproxy (http://vidar.gimp.org/?page_id=50). You need to install xterm, mplayer and python on your device. Follow the instructions on the lastfmproxy site to configure...