I came here to mention Armagetron, too. No other game stole my time quite like Armagetron did. If you many people out there want something new to try, give Armagetron a chance, you won't regret it!
Every time I am reminded of Armagetron I hear that low buzz sound of the lightcycles in my head. Right back in the saddle. Capture the flag Armagetron is awesome, going to have to reinstall it now!