Ever wanted to use your tablet as a bluetooth keyboard and mouse? I have.
Finally, someone took up this task and has succeeded. BlueMaemo turns your tablet into an input device for your PC. (And, yes, right+left mouse clicks, scroll wheel functionality, and customizable keymaps are all there, not to mention media and presentation controls.)
I've tried this baby out with Ubuntu Hardy, and works perfectly. It is also confirmed working with Windows XP and Vista. Mac, on the other hand... Well, it might be another story. If you're interested, please see the original discussion.
And, my advice... Get it now!