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I got these with the ARC-170 LEGO Starfighter (archived):
I'd like to get more if possible. They are a part of the cockpit.
That looks like 30384 Windscreen 7 x 4 x 2 Round. In general, BrickLink is a pretty decent place to browse around for parts identification. Peeron is also pretty good.
BrickLink provides a comprehensive list of windscreens both plain and decorated.
This is the Trans-Black Windscreen 7 x 4 x 2 Round
(7259) ARC-170 or (8088) ARC-170 Starfighter.
The part can be found in these sets on Bricklink and a cool alternative list.
Required, but never shown