Police Trainer... AWESOME Arcade game
Area51 is another one of my Arcade favorites (didn't it run off of the Ultra 64 hardware, meaning you might use a modified version of KIAME instead of MAME)
House of the Dead is another great one, HOTD1 for Saturn, HOTD2 for DC, and HOTD3 for Xbox, Here's hoping #4 makes it to the 360. All of them have arcade versions.
Time Crisis is easily one of the best Arcade Shooter series ever.
Crisis Zone, Silent Scope, Death Crimson, Confidential Mission, Jurassic Park, Mad Dog McCree, Drug Wars, Virtua Cop, are a few others I can think of.
If you have a SNES emulator see if you can find Some "Super Scope" games, I used to have one, it was like a light gun bazooka (IMG:
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It came bundled with "Super Scope 6" which was 6 mini games on one cart, but I think there were 1 or 2 other games