bit of a pain in the ass to download and I'm having some trouble getting online with it but... mechwarrior 4 is now free!
http://battletech.catalystgamelabs.com/2010/04/30/mechwarrior-4-free-release-available/
so I just got a free month of play time. I got a email from blizzard telling me my account was disabled for economy abuse. When i told them I hadn't logged in since december they reset my password and gave me free time.