Hello meamo community

I'm hoping for my N900 to arrive soon and I've mostly heard good things about it! However, I'm a bit scared that something goes wrong so here some general questions:

1. What is this "Light leak" some people talk about?
2. What should I check, when I get it, in terms of functionality (How to find dead pixels?)
3. What Screenprotector should I get? I've read lots of reviews and seen so many pros and cons that I'm pretty unsure
4. and a bit off topic: Has anyone ever tried VNC on a 3G network? Is it usable? Can it be switched to black-and-white?

I would very much appreciate some answers to this, and im so exciiiiiiiited about my new phonyphony