Ever get tied of your touchpad… you want to keep it enabled, but wouldn’t it be nice to sort of disable it automatically while your typing? Well… you can — check this out.
If you running Windows… hmmm… I have no clue on how to do this on Windows. BUT… at least you can under Ubuntu, and likely under different distros as well.
I know some HP’s (Jornada IIRC) have the option of doing so. Others have the option of turning it on/off by using Fn+?, not quite the same, but at least something.