Mecha

Mecha games for PC? Already have Mechwarrior and Mechcommander.

Battletech Crescent Hawk's Inception (and Crescent Hawk's Revenge, which is more of a slow-ass RTS).  The first game is all about pre-lawsuit anime turn based RPG badassness.  If only it was remade in some form.

Which Mechwarrior game do you have? You should get 2 for proper giant robot awesomeness(except for the bolt-style lasers, but that's bearable) and the first for an incredible campaign mode yet to be matched in the sequels.

For old-school tabletop style play, try Megamek.
http://megamek.sourceforge.net

For turn based strategy anime style mecha, there's PowerDolls. http://www.the-underdogs.org/game.php?id=1646

Heavy Gear 1 and 2 were good, and a bit faster paced than Mechwarrior.

For fast paced fighting, One Must Fall.
http://www.the-underdogs.org/game.php?id=789

You can also try the Mechwarrior rival series, Earthsiege 1, 2, and Starsiege.

Have the entire Mechwarrior series, and I played One Must Fall off a demo cd with 250000 games or so.

metal and lace. lololololololololol