I normally wouldn't do this, but I want to give this a bump.  EVERYONE THAT READS THIS POST (end caps) should get this game for free.  Even if you don't want the game.  You apparently get a $5 credit for spending nothing.  That means if a great deal comes up on green man gaming (and there have been a few), you get $5 off for the incredibly huge effort of creating an account on their site or logging in, clicking buy, and then benefiting later.  All that said, its a really great game.  BUT - I recommend everyone pick it up for nothing for the future discount.

Good deal coming up on amazon.  See here for details:

http://slickdeals.net/f/4636482-Starts-05-26-12-PC-Digital-Downloads-Mass-Effect-3-30-Tera-Online-25-or-CE-30-Sega-Genesis-48-Game-Pack-10-Sonic-Generations-7-50-Total-War-Shogun-2-7-49-More

Civilization 5 is free to play this weekend on Steam.  It's $7.50 for standard or $12.50 for the Game of the Year edition if you want to pick it up.

A special sale pack I found that I thought was worth mentioning, this one from amazon digital.  A Paradox pack:

http://www.amazon.com/dp/B0085CD7BE?tag=cheapassgam08-20

A lot of good stuff for about $12.50 - Crusader Kings 2 (worth it for that alone IMO), Magicka collection, Sword of the Stars 1 (complete), SoTS2 (which is getting much better and playable), and Victoria 2.   Really good buy, but I'm thinking its today only.  I believe that Magicka, SoTS2 and Crusader Kings 2 are all Steam activations.

Great deal call out there, fallingstar. 

Amazon has quite a sale on PC games. 

Plentiful Paradox Package [Download] - 6 Paradox games for $12.49 

Medal of Honor [Download] - $5.99 

Mafia II [Download] - $12

Omg that plentiful pack is a damn steal! Get that! 

Amazon has it for $26.99.  Redeemable via Steam.

Sid Meier's Civilization V: Gods and Kings [Download]

Here's a new one.  Just Cause 2 activated on steam - $3.74.  I heard some good things about this game if you are into the open world sandbox/blow up stuff genre.

http://slickdeals.net/f/4801256-Steam-Activated-Just-Cause-2-3-74

I know I was impressed when I went into Half-Priced-Books & they had just about every Paradox game & others for like $2-3 each, for $20 I came out with 7 or 8 total games

Spec Ops: The Line is 50% off at Amazon.  Activates on Steam.

Spec Ops: The Line

Anyone have spec ops and what do you think?

starcraft II - wings of liberty. $20 + shipping at micro center.  Best price I've seen on this game ever.

http://slickdeals.net/permadeal/76510/micro-center-starcraft-ii-wings-of-liberty-pc-mac-game

Civilization V: Gods and kings expansion - $19.49 at green man gaming.  Activates on steam.

http://slickdeals.net/f/4826120-Civilization-5-God-and-Kings-expansion-19-49-at-Green-Man-Gaming

And a pretty huge sale over on amazon:

http://slickdeals.net/f/4749402-PC-Download-Games-Packs-Virtua-Tennis-5-Psychonauts-4-Shogun-2-7-50-Stacking-7-50-Sega-Awesome-Pack-12-50-Binary-Domain-10-amp-Much-More

Max payne 3 for $30 and quite a few other good deals.  Suggest you take a look.

and more deals...

http://slickdeals.net/f/4749402-PC-Download-Games-Packs-Third-Wave-Plenty-of-EA-games-incl-Kingdoms-of-Amalur-25-Alice-MR-5-Dead-Space-1-2-5-ea-and-many-more

Quite a few good ones here - kingdoms of amalur for $25 - best price I've seen.  Not sure if you can activate it on steam or not.  Worth a look.