Disciple II: Gold Edition is free at GMG for the next 48ish hours.
Site’s slow since people like their free stuff but you can “purchase” it and download it at some other date.
There are 2 simultaneous free weekends on steam - Civ 5 and Red Orchestra 2. You can play the full versions free until Sunday at 1pm PST. I’ll be trying to organize some RO2 games, so contact me if you’re interested. Just go to your games library and install them - restart steam if they aren’t there. RO2 is 75% off ($10) and Civ 5 is 75% off too ($7.50 base game, $12.50 GOTY) if you decide to buy them.
Other steam sales: Metro 2033 $5, Braid $2.50, Dungeon Defenders $7.50, Binding of Isaac $2, Osmos $3… actually quite a few things that aren’t on the front page but that are listed in the specials… seems to be some sort of indie game sale.
Saints Row 3 is $17 on GamersGate.
This is the “Because We May” sale that is currently going on across Steam, iOS and Android.
Trine is $1.50 at GMG. Like Just Cause 2, it’s a game I plug whenever it comes up despite being around for a while now. One of those “can’t go wrong at that price” deals.
Latest and greatest Humble Bundle is up. The last couple have been iffy (I mainly got them for the Android app versions) but this one is pretty golden.
Amnesia: The Dark Descent
Limbo
Psychonauts
Superbrothers: Swords & Sorcery EP
– and pay over the average to get –
Bastion
Bastion is an awesome game. I haven’t played but heard Limbo & Psychonauts highly recommended and Amnesia is the the go-to when someone asks “Name the scariest game you can…”
The ‘worst’ part about this bundle is that a lot of people probably own some or all of these already because they’re so well regarded. If you don’t, this is your chance to get them inexpensively.
Yeah, I’m really glad about this Bundle. These are the games I’ve heard about but haven’t played. I did watch an LP of Bastion (which actually makes me despair a little about accomplishing everything in the game). I’m definitely picking this one up.
For those who don’t know, the Bundle is “pay what you want”. You get the bonus game (Bastion) if you pay more than the current average (which is at the moment still under $10).
I came in make sure the latest Humble Bundle was mentioned. Since it already is, I’ll toss out that I already have Amnesia. It’s very atmospheric and cower-in-the-corner-because-you-can’t-fight-the-monsters scary. It’s mostly puzzles and evading monsters, with a health and a sanity mechanic (stay out of the dark!). This is a perfect excuse to pick up Psychonauts and Limbo, which have been on my “maybe at the right price” list.
I’ll also add that Amazon has a deal on Paradox games, including a bundle with Crusader Kings II, Victoria II, 2 Magicka games, and 2 Swords of the Stars games for under $13. I’ve been waiting for Crusader Kings II to drop to that price, so the bundle was a no-brainer. As mentioned up-thread, Amazon’s promotion of these deals is lousy.
Yeah I was really excited to get this one for Psychonauts and Limbo, then when I went to Steam I realized I already had Limbo. Oh well! I haven’t heard of Bastion before, so that may be interesting, and I’ve definitely heard of Amnesia but don’t know if I have the guts to play it 
I haven’t used D2D since they became gamefly, but they’re having a sale right now that’s got some good stuff. Batman: Arkham City for $7.50 is the best deal on that by far. GTA4 $5, COD:MW2 $10, Batman: AA $5.
New sales every 48 hours apparently. Here’s the current sale, not sure if the link will change for the next one, but just check their page.
Steam has the entire Mount & Blade collection for $8.75 as it’s daily (Paradox) deal.
Bought. Thanks for the info 
Skip over the original Mount and Blade, since Warband has everything it has and more.
New day in the gamefly sale.
Crysis/Warhead maximum edition $4.50. Just Cause 2 $5 (will be on steam for that price in a few weeks surely), $10 tropico 4, others. Is that Sniper: Ghost Warrior game worth $5?
Put on your hipster glasses and go retro with Worlds of Ultima 1 & 2 for free at GOG. They don’t list an expiration on the offer so I don’t know if they’re permanently free or a limited offer.
Last day of the gamefly/d2d sale, seems like a best of type sale.
More free stuff – Green Man Gaming is giving away Commandos 3: Destination Berlin. You also get a 10% voucher on various games including the new Quantum Conundrum if you were interested in it.
Offer only lasts until 1100 UTC on June 22nd (6:00am Central US time tomorrow). As always, you can just “buy” it now and not bother downloading it until you’re good and ready.
Everything Deus Ex related is 75% off on Steam this weekend. Pick up Deux Ex: Human Revolution for £4.99 or the DLC for £2.24 (sorry, I don’t know the price in dollars).
GMG has a 25% off voucher for Quantum Conundrum for the next 15ish hours.
Quantum Conundrum - $11.25 with voucher
QC Season Pass (base game + two future DLC) - $15 with voucher
Alan Wake is $10 on GMG for the next 15 hours. $12 for the Collector’s Edition (PDF comic & soundtrack)
And, of course, Steam Summer Sale starts this week (Wednesday or Thursday).
LA Noire on Steam’s midweek madness for $4.99 or $7.49 with all DLC.