Re: Good RTS?
Some recent ones:
C&C 3 was fantastic.
Company of Heroes series was awesome as well imo. Or Try Warhammer 40K series for a sci fi take on the formula. Both by relic.
Supreme Commander: I didn't care for this game but if you played and enjoyed Total Annihilation you'll like this.
Fresh on the block:
I haven't tried World in Conflict and Universe at War yet, but both have demos and have gotten solid scores from most places. They look good.
EDIT: All PC games BTW.