I still play Total Annihilation, TA:K and Star Fleet Command II
In the last year I have revisited Dune 2000, Star Craft, Dawn of War: Dark Crusade, Moo1, Moo2, Moo3, Giants: Citizen Kabuto, Star Control 2, Homeworld and Star Fleet Command.
I have been having an urge to revisit Sacrifice, Solaris (atari 2600), Star Flight, Sword of Sodan (amiga), Heroes of the Lance (Atari ST), Dark Colony, Sword of Aragon, and Phantasie (PC). All of these games have some parts of greatness that I want to lock in on. Of course I was a kid for some of them, so might be smoking crack... kind of like when you revisit STNG (as pointed out by Draginol) that it is not nearly as awesome as you remember.