This week I found out you can legally download the games of the MechCommander series legally from mechcommander.org
For those who don't now, MechCommander was a series of RTS games set in the Battletech universe. Well worth a look for any fan of the genre and even more so for those who loved the Mechwarrior series of sims as there are plenty of familiar Mechs to play with.
Available for download are: MechCommander MechCommander Gold MechCommander 2
and there are also lots of other groovy add ons and mods available so go check it out