In the time since Alasdair wrote about Crawl and its superb trailer earlier today, the arcade-y multiplayer dungeon crawler has been approved for release on Steam. Nice timing there. A bunch of other games were greenlit too, as is the case nowadays, but this was the standout by far.
Other Steam Greenlight titles I have heard of before that might just be of interest to you include: boardgame 100% Orange Juice, hacker sim Disrupt, Metroid throwback ReVeN, and, finally, the turn-based tactical RPG Telepath Tactics.
Am I missing anything here? Besides 18 Wheels of Steel: Extreme Trucker 2, obviously.
I need this.