I run Ubuntu on my home computer, and have recently found a PSX emulator that has given me hours of fun.  It was immediate to install, no configuration, unloke the Windows one I fought with for 2 hours download plugins.  The only issue I have now is that City of Heroes randomly stopped working. :( And darn, there's still no tyVille client for Linux either.  Maybe there'll be one soon, since there's a Mac client.  It is my favourite program after all...