Well, Arkowi (and all the others amongst you wrestling with this decision), having both a matte-finish MacBook Pro and a glossy-screened MacBook in the house, I can sum up my observations of the glossy screen in one short sentence: It ain't too shabby.
The glossy finish is not that horrible super-shine that I've seen on oh so many HP laptops in the local Comp USA or Best Buy. My good friend Randall has a glossy-screened HP laptop that I've been forced to use from time to time, and although he loves it, I've gotten a nasty headache any time I've sat down and used it for any length of time. I've used my wife's MacBook quite a bit so far, especially when I was setting it up, and I've enjoyed it. the screen is slightly brighter than the matte screen on my MacBook Pro and bright enough that the reflections are not distracting in consistent lighting.
However, I'd still pick matte for myself. It's all a matter of taste. Try both out in an Apple Store before you buy, if you can, and make sure you read through Scott's take on this topic.