Have:
50% Off Delve Deeper
Oddworld: Abe's Odyssey
Avalon (probably will keep)
Half Life 2 Episode 1 (contains Half-Life 2: Deathmatch, Half-Life 2: Lost Coast, Half-Life Deathmatch: Source, Half-Life 2: Episode One)
Want: Coal
Any other games
Edit: Here's the list of stuff I've got already...