Civ is a really neat strategy game. You found cities, produce units, research technologies, and fight, befriend or simply surpass your neighbors. It has a bunch of neat DLC (vikings, anyone?), multiplayer, and scenarios encase you're bored of just playing historically and geographically inaccurate freeform games.
So please, if you like strategy at all, take advantage of the free weekend. If you buy it, I'd love to have a real opponent for once.

Torchlight is very, very good at what it does. It's simple, fun and addictive. There are multitudinous types of monsters to fight, the art style is enchanting, and there are more weapons and weapon variants than imaginable. Randomized dungeons make every passageway and treasure chest different from your previous playthrough - and you don't even have to leave the dungeon to sell your loot! Your faithful wolf or lynx will haul your stuff back to the market for you. Which is good, because there's LOTS of loot. Especially when you fight two bosses at the same time and somehow get out alive...*shudder*
So, do yourself a favor and pre-order Torchlight II- because you'll get a free copy of Torchlight to play while you wait for the undoubtedly awesome sequel, which, by the way, has multiplayer support. Woohoo!

The original Portal was good. I enjoyed it.
Portal 2, on the other hand, is absolutely brilliant. They doubled the goodness of Portal 1 and tripled its humor. They also added a bit of a backstory for Aperture Labaratories and GlaDOS, and included three new characters: Wheatley, the loveable sphere sporting a simulated Australian accent, and the co-op mode-exclusive Atlas and P-Body.
Now, scroll down to the 'Buy Portal Bundle' box and click the big green 'add to cart' button. If you've already got Portal- well, if you've already got Portal, why aren't you playing Portal 2 right now?