I've spent a lot this time round and I daren't look how much to be honest. Probably some pretty stupid purchases too because in all likelihood, I won't even get round to playing some of them until next sale when they'll be even cheaper.
Picked up:
State of Decay
Prison Architect
Hitman Absolution
Dragon Age Origins (don't know why, I've played it through on console :/)
LA Noire (because the full DLC pack was cheaper than the discounted game so rude not to)
Saints Row IV
Metal Gear Rising
Dishonored DLC
Dragon Commander
Wolfenstein
As for big discounts hurting developers, I've noticed increasingly how DLC doesn't get the same discounts which must at least help them out. There's plenty of games I've bought in steam sales for next to nothing where I've gone onto to buy DLC for them costing more than I spent on the game because I enjoyed it.