DO NOT - I REPEAT -DDOOOOO NOOOOTTTTT use paper towels. Paper towels have texture for a reason - to pick up grease. This makes sense for use on counters, hands, whatever. On a fragile PB screeen - this texture can leave small abrasions - DO NOT USE PAPER TOWELS - i can't stress this enough. sure, it may look alright for awhile but after prolonged usage your screen will start to get cloudy.
Personally, I second powermac666's suggestion f the radtech cloth - the cloth + a bit of water - the screen looks brand spanin new. I even use it on my glasses all the time - something I would never do with a paper towel.
Originally I bought the iKlear Apple Polish - works great - only on a totally cold screen tough - otherwise it streaks. Buy a radtech screensaverz - you won't be sorry.