If you take your laptop with you everywhere and use it constantly, you're liable to get a build-up of hairs, crumbs, and other detritus in the keyboard. To clean them out, take a Post-It note (the new 'super sticky' kind especially good for this) and run the adhesive edge through the cracks in the keys. Doing this is also a great way to stall when you can't think of what to write next.

and the award for Random Comptuer Tip of the day goes to....

though, thas a great idea, i might try it.