Reiner: I own Blades of Exile on CD. Sweet stuff to the max.
La Mulana: One of the most amazing and hardest freeware games in all of existence. If people are having problems patching it, I can upload the patches and instructions to get it working, since last I checked, the patch on the site only patches the manual, and there's an older patch floating around that patches it properly. It's the ultimate Metroidvania/puzzle solving platforming game.
Tyrian 2000: The best PC vertically scrolling shooter I've ever played.
Betrayal at Krondor: One kickass, difficult, relatively unique old fantasy RPGish thing. It has a story written by a fantasy author I've never heard of but who can apparently write a damned good story, and is designed to be like an interactive, branching book. There are also chests which are opened by solving riddles engraved on them. This is the personally the greatest idea I've ever run across in gaming.
Frets on Fire: This is if you love Guitar Hero, but don't love the price tags or don't own the appropriate systems to play the games on. Rock out with your keyboard instead, holding it like a guitar. You can also find the GH 1,2 and 3 songs floating around on the Interwebs.
Ancient Domains of Mystery: The greatest Rogue-like game in existence. Spectacularly complex, enormous, and so very versatile. You can stand under a waterfall to rust your cursed iron helmet to pieces, hack up corpses to eat them for food, or worship one of the gods of the land to help you get out of sticky situations in between wearing, forging, or building whatever equipment you like. The website seems to be having problems at the moment, but it did load for me.
ChefElf: Nothing I've played by Yahtzee has ever been worth JOY, though the games I have played ranged from alright to quite fun. I found the Rob Blanc games rather funny.
Edit: Though to be fair, the Rob Blanc trilogy was part of the series of Internet hops I took to stumble upon Lance and Eskimo back in 2000 or 2001, so he deserves some props for that.
This post has been edited by Slade: 18 November 2007 - 11:30 AM