Skyroads is a strange little game that I stumbled across a long time ago.  The game play and graphics are relatively simple - but the game is incredibly addictive.  Basically you maneuver a small space ship down a three dimensional path, through tunnels and jumping from platform to platform.  And once again - it runs perfectly under Virtual PC:

You can download SkyRoads from here: http://www.bluemoon.ee/history/skyroads/skyroads.zip and find out some history about the game here: http://www.bluemoon.ee/history/skyroads/index.html

Cheers,
Ben