So I purchased a Radtech Screensaverz cloth upon the recommendations of many people here for my new powerbook because I realize from past experience that the screen is THE most important part of a notebook over time... my last notebook's screen became utterly disgusting after a year and a half of use, and so I got the cloth today. It worked beautifully! The best part is that I thought I had a dead pixel on my screen - it was just one pixel towards the center of the screen, but the weird part was that it didn't seem dead all the time. It only seemed weird when it was in a white area of the screen; when there was a darker color, it just looked normal.
After using the radtech thing, it went away! This is so awesome, I thought I was going to have to take my pb in to be serviced! :-D woohoo!