X-link to the DRM-free thread for two new bundles:
Humble Book Bundle Adventures in Science Fiction presented by Open Road Media contains a nice selection of backlist titles from their well-known and award-winning authors, including Eleanor Arnason (I've been meaning to try more of her work after having being impressed by an Asimov's Reader Choice-winning novella that got reprinted in Lightspeed Magazine), Harlan Ellison (The City on the Edge of Forever original manuscript and memoir for Star Trek fans), Andre Norton, Alan Dean Foster (complete 3-novel Icerigger Trilogy), Poul Anderson, Joe Haldeman, Octavia E. Butler, Bruce Sterling (a Nebula-nominated novel), John Brunner, and many more. Some overlap with previous bundles offered ages ago, but overall a very nice selection across a broad range of subgenres.
StoryBundle is offering
The Adventure Sci-Fi Bundle curated by Kevin J. Anderson, with mainly indie/newer titles, but also at least 4 backlist reprints from fellow MR member author Robert J. Sawyer, the late Robert Asprin, Jody Lynn Nye, and Brenda Cooper, from Ace and Tor books respectively (RJS' was from both, having been originally published by one, and then reprinted by the other).