To celebrate its fifth anniversary, Tor.com is giving away an e-book with all the original short fiction that's been published there, 151 stories by a bunch of big genre names and up-and-coming new talents.
Link.
You have to be a registered member to download, but registration is immediate and relatively simple. Some people are reporting login issues; there's an e-mail address in comment #14 at the link if you're stuck.
The e-book is available in PDF, mobi, and epub. It looks like they've simply combined individual e-book versions of the stories into one gigantic bundle (the PDF is 3800 pages). You can see the full TOC
here.