A Few Great Games You've Probably Never Played

I'll make an attempt to give each of these games more thorough reviews in the near future, but in my opinion, you can't go wrong with any one of them:

Dwarf Fortress: Possibly the greatest RTS / builder / god game of all time. Gather your dwarves and carve them a home in the mountainside. Incredibly deep, but the learning curve is worth it.

Ancient Domains of Mystery: An extremely deep and challenging Roguelike. Many secrets await.

Venture the Void: If you like the StarLancer / Freelancer genre, give this one a try. The developer offers a four-hour trial, the one-time-for-life subscription fee is more than reasonable, the downloadable galaxies are huge, and the gameplay is robust. Not truly MMO, but player effects can be felt throughout the game worlds. Good stuff!

Dungeon Runners: A great Diablo-style MMO that can be played for free or for a lower-than usual monthly fee. Very tongue-in-cheek sense of humor, with tons of references to Monty Python, other games, and pop culture in general.