If that sheet of plastic goes for more than a year without a visible scratch, the price somehow doesn't seem that outrageous anymore. I've tried DIY protectors, but never managed to get more than a few weeks of useful life out of them.

I now use a Schutzfolien24 protector, but I still think the NuShields are the best and they now (finally) have Nokia models. NuShields don't have adhesive backs, but cling to the screen all by themselves. They also have great writing feedback, which -- due to the abysmal HWR of the Tablets -- is obviously of limited use.