Okay, slow down.

In xterm
xbindkeys -k

Yep, you'll get a new window.

Press something like the "A" button on your keyboard.

Do you get a result from this? If so, what was the read out of it?

I'm not all too sure if xbindkeys will even work with the N900 tablet but this would be a first simple test to see if it's running correctly.

Cheers.