My latest computer game is Rise of Nations, a real time strategy game headed up by Brian Reynolds, designer of Alpha Centauri. The best review/summary of what makes RoN great is this fan post.
RoN sets itself apart from other RTS with a feature borrowed from Alpha Centauri - territory. You can't just waltz your superarmy in, you have to fight for control of land. It gives the game a lot of strategic depth. Otherwise it borrows very effectively from the RTS genre.
I'm looking for people to play online with - if you're interested, drop me an email at firstname.lastname@example.org.