Well, the Humble Weekly Bundle looks pretty awesome for this week. Might buy the $1 tier at least, which has 140, Kami, and Ballpoint Universe Infinite.
Also, BundleStars just released the Reboot 5.0 Bundle today, which has another UFO game as well as Mount & Blade, along with maybe 4 or 5 other games, for $2. I might buy, but I'd rather have M&B: Warband.
Lastly, BundleStars Reboot 4.0 Bundle is one of the best I've ever bought. It gives Tropico 1, 2, and 3 along with 4 or 5 other games (Hard Reset is awesome!) for I believe $3 right now.
I like this topic, since I'm a sucker for bundles. They're one of my main sources for games, and I always try to get the best ones and keep people posted on new ones whenever I can. --- "Opinions are like magnets, nobody knows how they work." - Foppe