Books on the Knob, Pixel of Ink, and iReader Review are three blogs that feature free & bargain ebooks daily. If you want to start simple there's OpenCulture's 375 Free eBooks list but if you don't mind doing some footwork then there's this very comprehensive 614 Places for Free eBooks Online post (with divisions of content by genre) on Gizmo's Freeware. [more inside]
posted by flex on Oct 4, 2012 - 12 comments

Wow. I was going to say something witty and clever, and I got nothin, so: "The new Web-based Sony Library Finder tool can be used to find e-books in the local library that can be checked out, downloaded onto a desktop computer and then loaded onto a Sony Reader device -- all without charge." [Note - Probably USian] [more inside]
posted by ZakDaddy on Aug 26, 2009 - 62 comments

A 4-star rated book on CSS: The Art & Science of CSS is a FREE DOWNLOAD for 14 days from the folks at Sitepoint. Reader reviews give it 4 stars at Amazon. 208 pages. [more inside]
posted by spock on Nov 19, 2008 - 32 comments

Munseys, formerly Blackmask, still my favorite free book site.
posted by StrikeTheViol on Nov 12, 2007 - 7 comments

"Build Your Own Ruby on Rails Web Applications" book is free for 60 days. Reader reviews give it 4-stars at Amazon. Like most first editions, there are a few typos to watch out for. [more inside]
posted by spock on Oct 3, 2007 - 48 comments