Some of the extra buttons are actually part of the keyboard and can be made
to work with a little effort. On my machine I use them to launch the
browser, email, etc.
On an i8000 they keys that work are:
* Dell logo / Play/pause
* "i" / Stop
* "1" / Rewind
* "2" / Fast Forward
The sound volume up and down buttons are not real keys.
There was an article on setting this up a few weeks ago, but I can't find
that particular one. Here's another which is less comprehensive, but should