Halloween Sale - 50-75% off select titles (list inside)

[NiX]

Dark Fall: Lost Souls - $6.79, 66% off.

Aliens vs. Predator - $9.99, 50% off.

Ghostbusters: The Videogame - $9.99, 50% off.

Devil May Cry 4 - $9.99, 50% off.

Ghost Master - $2.49, 50% off.

Dracula Origin - $4.99, 75% off.

Doom Rails - $4.99, 50% off.

Amnesia: The Dark Descent - $13.39, 33% off.

Nation Red - $3.39, 66% off.

Plants vs. Zombies: GOTY Edition - $4.99, 50% off.

Resident Evil 5 - $14.99, 50% off.

Alter Ego - $14.99, 50% off.

Zombie Bowl-o-Rama - $2.49, 75% off.

Left 4 Dead Bundle - $14.99, 50% off (Separately: 50% off both versions, $10 each.)

Burn Zombie Burn! - $4.99, 50% off.

Zombie Driver - $4.99, 50% off.

Team Fortress 2 - $9.99, 50% off.

BioShock - $4.99, 75% off.

Dead Space - $9.99, 50% off.

Overlord Complete Pack - $7.49, 75% off. (Separately: 75% off, Overlord - $1.24, Expansion: $2.49, Overlord II: $4.99

Silent Hill Homecoming - $19.99, 50% off.

Worms Reloaded - $9.99, 50% off.

Haunted House - $9.99, 50% off.

[Ard]

The Stalker bundle is also on sale, although not directly tied to this sale, apparently.  $9.99 for both SoC and CoP.

http://store.steampowered.com/sub/5011/

[Teleku]

Ohh, I hadn't even noticed that Worms: Reloaded game before.  I loved Worms: Armageddon.

Any of these other games worth getting?  Lots of Indie games on the list I have no clue about.

[Ard]

I liked Ghost Master for $2.50 last time it was that low.  It's amusing for what it is.

I hear Amnesia will make you crap yourself, but you can get it cheaper from stardock right now, if the price point is the issue.  Both it and Penumbra are $10 each right now there.
http://www.impulsedriven.com/amnesiatdd

I liked Overlord a fair amount, but never beat it, and my wife loved it and beat both multiple times, so if you haven't tried the demo for either the first or the second, I'd go do that.  I think they're a steal for both at $7.50