I just wanted to let you all know that I have posted a free Pac-Man-style game called
Cruncher on my website,
http://www.jhanson.com. The game uses MAME-default keys, and has a special "cabinet mode" built in that lets it accept quarters. There is a way to change the keys if you need to customize it for your cabinet, but it is unsupported. It runs in 640x480 full-screen mode, or a windowed mode if you prefer.
There are two versions available - one for Windows and one for Mac OS X. The Windows one has been tested on Windows XP, and should run fine on Windows 2000. It might possibly run on 98, but I've heard there are potential sound issues with the sound system I used for it. The Mac version has been tested on 10.4 (Tiger), and may run on earlier versions of OS X.
Enjoy!