I am going to combine Get Wood Working Week and Safety Week.
When using a powered sander it is easier to remember to put on the correct safety gear. They are loud and they make a lot of dust. But say you were going to hand sand an edge or a detail you can't handle with the sander would you think to put on a dust mask?
I didn't one evening last summer and ended up with one of the worst sinus infections I've had. Prior to then I always used the simple paper dust mask. Since then I have upgrade to a half face respirator that I use with dust filter. I don't use the cartridges that are used for fumes because I am just trying to keep my lungs and sinuses free from the dust. Looks silly but it works good for me.
Check out my post from last years Get Woodworking Week: Get woodworking: Shellac, this beginners favorite finish.
Edit (4-29-13): adding the safety day badge. Please be safe in your shop.