Some really amazing stuff in today's Steam Sale! I'm going to get right to the details.
Mass Effect and Mass Effect 2: $4.99 each. The Mass Effect series is the best RPG series of at least the last five or so years, IMHO. I am almost beside myself with anticipation of the third one. Grabbing the first two for a combined total of $10 is one of the best uses of your gaming dollar I could imagine.
Torchlight: $3.74 - One of the best Diablo-likes ever made, including the Diablo games themselves. It's very satisfying, and funny to boot. Will play on anything down to and including a netbook.
Brink: $4.99 - I really enjoyed Brink, especially its world and setting, but my love of it was far from universal. Still, for $5, I'd recommend trying it to see if you like it.
Divinity II: The Dragon Knight Saga: $9.99 - I've yet to finish this, but I have gotten a lot of fun hours out of it. The hero has more unique and cool stuff they can do than most game heroes, and you can play a complete smart-alec who is still a good guy with ease. It does a lot of interesting things and is well-worth playing.
What I'm getting: I'm not sure yet, as I'm typing this on my lunch break at work, but I think I'll pick up Avadon: The Black Fortress (I like Spiderweb software games I've tried so far) and I might pony up the $3.74 to get Torchlight on Steam instead of Direct2Drive (which is going away soon).