Here are a few of my "hidden gems," expanded from my post to the "favorite games" thread.
1.
Laser Squad Nemesis - from the Gollup brothers, who created X-Com. Free demo, cheap to try, continuing requires a subscription but it's $40 for a year, not $30/month.
2.
Battle for Wesnoth - open source (therefore, free!) Fantasy TBS: not like Dom 3, it's played in skirmishes or campaigns on hex maps and no "world map" or research.
3.
Endgame: Singularity - also open source. It's like X-Com without the squad combat - you play as a spontaneous AI, trying to self-realize before paranoid humans wipe you off the net. A much smaller and shorter game than LSN and Wesnoth, but all the more a must-play for that.
I mostly find out about new indie games from
Play This Thing! and I;m not just plugging it because my review of Dom 3 will be going up sometime soon (I offered to review Dom 3 for them because it was the only really cool "new" computer game I've found in the past two years that they haven't reviewed).
For retro/abandonware, I've given up on Home of the Underdogs and have found
http://www.abandonia.com/">Abandonia to be great. I'll play Nobunga's Ambition someday, I really will.
Ok, that's enough from me.
I need to go to sleep.