Akka Arrh
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Here's an unreleased game that was made back in 1982 that can be summed up as Tempest in reverse with raster graphics instead of vectors.
I, Robot
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This was the first video game to use polygon graphics, but the release of this was during the '83-'84 Video Game Crash. That, as a result, killed its chances of any sucess.
Marble Madness 2: Marble Man
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It's too bad that this was never released, because I think it looks just as fun as the first Marble Madness. Plus, it makes you wonder why Midway didn't include it with their Arcade Treasures series.
Dan Coogan's Gravitar Site-A really neat resource into Atari's Gravitar.
Owen Rubin-This man has worked on mostly obscure arcade titles such as Major Havoc, Orbit (a raster version of Spacewar), Tunnel Hunt, Goalie Ghost, and Space Duel (a color version of Asteroids that allowed two simultaneous players).
Siggraph's interview with Mr. Rubin-A look into what it was like working on old vector games.
Unrelated Links
John Stossel on Milton Friedman's Free To Choose