I use an PowerBook which is matte, and a MacBook Pro which is glossy.
I much prefer glossy. Here's why:
Both of them have the same color accuracy, the same depth of black and brightness of white. Both of them reflect light when there's something bright behind me. The difference is that when there's a reflection of something behind me on the matte screen, it's very blurred and dispersed. The same reflection on the glossy screen is crystal clear. I think this is an important difference because my brain can sort of identify and remove/ignore the well defined reflection from the glossy screen, but it can't do the same with the blurry ambiguous reflection on the matte.
Another argument is that you can tilt or turn your mac to avoid the worst reflections using a glossy display, but the matte display reflects light from all random angles so you can't turn one way to avoid them.
I would like to have a choice, but as a shareholder I think that it makes good business sense to stick with one option, and the best option is glossy.