Or on any other summer sale, like Amazon's for example.

So far I've got:

Civilization V: Brave New World

About 5 hours into my first playthrough with this on epic speed, and unlike G&K it's more of a late game changer so I'm not balls deep in it yet, but so far it's added a few nice little touches like trade routes and new civs/techs/wonders etc. I have no doubt that this'll add another 50 hours to my 300 hour count on Civ 5.

Deadlight

Civ (and tlou mp) are taking up all my gaming time so I haven't spent much time with this, only an hour or so. I think I might finally be finding the zombie theme a little oversaturated but luckily this focuses more on puzzles and platforming than combat, at least early on.

Rising Storm

I've been craving a good WW2 shooter for a while now, though I did regret buying it after I realised there was no single player content. Oh well, I'm still looking forward to playing it some day.

I got Just Cause 2, Hotline Miami, The Witcher, The Witcher 2, Ricochet, Victoria II: A Heart of Darkness, Rogue Legacy and Payday: The Heist

Scribblenauts Unlimited, Sleeping Dogs, Ace of Spades, Dust: An Elysian Tail, Torchlight II, Castle Crashers

£20 for BNW (missed the cut ;(), £5 for Deadlight, £7.50 for Rising Storm. So 32.50 great british pound sterling.

Hitman Absolution
Tomb Raider
Sleeping Dogs
Dark Souls
Risen2
Skyrim Legendary
DeusEx Human Revolution
Bioshock1+2
Dead Island
Borderlands 2 Season Pass + Psycho
Fallout New Vegas
Sonic Generations
The Witcher 2
Civlization 4 GOLD
Civilization 5 GOLD(or complete or whatever)
Orcs Must Die 2
Torchlight 2
XCOM Enemy Unknown

There's still 4 more days of Steam Sales, it's too soon to count the booty.

it's actually $50 for 2 games and 1 expansion pack

Not much since my PC is a bit older and I'm primary a console gamer

Hotline Miami for $2.50 (which I just beat, excellent game although I don't like the story much. Either way excellent game for a indie title. Loved almost every minute of it.)
Organ Trail: Director's Cut $1.50 (Can't say no to $1ish games. Great throwback, tough as nails to. I have yet to beat it.)
System Shock 2 $2.50 (Hasn't aged as well, but needed to own this classic).

Last year I just bought Torchlight 2 and The Witcher 1. So I guess I bought more this year. I'll be buying more titles if something good comes out for $3 or less.

Nothing yet, i might get something on the last day. I haven't really played the games i bought from the Christmas sales yet

dark soles prepare to die edition