The funny thing is, despite this thread being warmed over at least half a dozen times, no one has accurate data beyond their opinions about this. I want somebody with access to both a glossy and a matte MBP to use a color accuracy measuring device and see if it's just perception or there really is a huge variance.
I love my (dumb) friend's VAIO, or at least the big glossy 17" screen, but she only uses it for web and email and the occasional game. I would be using my MBP for graphics, illustration, prepress, retouching, video editing, webdev, etc, so color accuracy over "saturated blacks/colors" is more important. Plus the glare can be annoying... maybe that's reason enough.