Hmmm.. I guess for me this is just a favourite games list?
Total Annihilation probably wins as a game that I install and play all the way through every couple years. I still haven't unwrapped Supreme Commander - since Total Annihilation is so good. (I got bored with Starcraft pretty quickly)
I recently played through most of the LucasArts Adventures again - although this time I skipped Monkey Island completely.
I've never really owned a console... as I went straight from C64/Amiga to PC (I don't consider anything with a keyboard to be a console) - but all of my friends owned Sega consoles and none of them owned Nintendo consoles - So I don't have any passion for Nintendo at all. In fact I really don't understand the immense popularity of Nintendo in US/Japan. The Giana Sisters, Sonic and Cosmos cosmic adventure are better plaformers than any of the mario platformers. Then there are much better ones like Another world and Flashback. I think I prefer Ghosts and Goblins and Altered Beast to Mario? (I'm not trying to troll - I just feel like there's something I'm not "getting" when it comes to Nintendo)
Commodore/Amiga/Sega
Bubble Bobble, Barbarian, International Karate, Boulder Dash, Commando, Cybernoid 2, Gauntlet, Altered Beast, Golden Axe
The "Games" (Summer, Winter, California, Skate or die)
PC
Total Annihilation
Monkey Island Series (And other Lucasarts adventures)
Syndicate
Warcraft: Orcs and Humans
Jagged Alliance series / Silent Storm
Interstate 76
Baldurs Gate etc..
Total war etc..
Codename: Eagle
Wolfenstein: Enemy Territory.
Halflife + CS
Yeah but seriously - if you like RTS and you've never played TA - get to GOG.com and spend 5 bucks!!