The Pragmatic Programmer
by Andrew Hunt and David Thomas
Crafting Rails Applications
by José Valim
HTML5 & CSS
by Brian P. Hogan
Pragmatic Guide to Git
by Travis Swicegood
Deploying Rails Applications
by Ezra Zygmuntowicz, Bruce Tate, and Clinton Begin
Seven Languages in Seven Weeks
by Bruce A. Tate
The RSpec Book
by David Chelimsky, Dave Astels, Zach Dennis, Aslak Hellesøy, Bryan Helmkamp, Dan North
a bit wiser 