System Shock 2 is 75% off today ($2.49), which sure was enough to convince me to buy it. Now I'll just have to decide if I'll ever finish the original game or just skip it.
Also, there's an "indie" promo:
Pick 5 Games & Save 80%
Sadly, I already own most of the games worth owning on that list (which are quite few; if I had to pick, I'd take The Blackwell bundle, Primordia, Amnesia, The Penumbra Collection and probably The Cat Lady).
Damn it GOG! (Throws money at the screen...)
I also purchased System Shock 2 during the 50% sale, but it was awesome and worth the price. Definitely recommend.
For the 80% off sale I already have Torchlight, Primordia, and the Blackwell Bundle, none of which I've gotten around to finishing. I also got Stacking on Steam, but haven't played it yet either.
Out of the remaining games for sale, I'm thinking about picking up Strike Suit Zero, Driftmoon, Sword of the Stars: The Pit (been waiting for a GOG sale on this since I prefer it to Steam), and Dyad. Anyone want to convince me otherwise? Any suggestions about what I should pick up as the fifth game? I was thinking of grabbing Anodyne because I like the idea behind the game, but the reviews are pretty lackluster.