Are you trying to decide between a matte and glossy screen on a new laptop? I think this picture speaks for itself. The laptop on the bottom is glossy (our new "backup" laptop at BloomSpot), the monitor on top is matte. Both are displaying a fully black terminal.
Conclusion: You could already have guessed this, but Glossy is the wrong choice, especially for developers and really in general people who spend time in bright offices working directly on their laptop. Go with Matte!