X-link to the DRM-free thread for some new bundles:
Humble Book Bundle Stellar Sci-Fi & Fantasy presented by Tachyon lives up to its name, with a truly excellent selection of short story collections, novellas, and anthologies, and even a non-fiction book of essays from Cory Doctorow, Patricia A. McKillip, Nalo Hopkinson, Peter Watts, Tad Williams, Alistair Reynolds, Joe R. Lansdale, Nancy Kress, and many more.
StoryBundle's
The Neo-Noir Bundle contains hybrid mystery/thriller works done in a noir style, mainly for sfnal subgenres including alternate history, supernatural, high fantasy, superhero, and more. Mainly indie authors, but a few more established ones with traditional publication and/or franchise tie-in credits. And there's a bonus freebie for newsletter subscribers.