Humble Bundle

There are currently two great bundles at Humble Bundle, an Android one and one of the best recent ones, a weekly Japanese bundle. All games in the weekly bundle are available both as Steam keys are DRM free. One Way Heroic being the pick of the games in my opinion, a very original roguelike.

BundleStars - The Majestic Indie Bundle

Including Mount and Blade, Crusader Kings Complete and Majesty 2 Collection and 6 other games, all Steam codes, current price for them all: £2.97. Majestic Indie Bunle

BundleStars Simulator Bundle

Just found a really good bundle on BundleStars with simulators including Trainz and Euro Truck Simulator games for under £3. Nine games in total. Here is the link:
BundleStars Simulator Bundle

Steam Deals

A few noteworthy offers at Steam

Indie Royale

IndieGala October Bundle

Indie Gala has a great bundle this month. It is a mix of Steam and Desura keys. The current minimum to unlock all 14 games is $5.49. Highlights include Two Worlds II, Crusader Kings II and Fairy Bloom Freesia.
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Noteworthy deals
Just a quick round up of deals currently on the internet for digital games.
Batman Arkham City GOTY 75% off on Steam
Groupees Build a 1C Mega Bundle
Mostly 75% off Simulation games on GamersGate