Conceptual Mathematics: A First Introduction to Categories
F. William Lawvere, Stephen Hoel Schanuel
Better Together
David L. Craddock
The Pocket Guide to Debugging
Julia Evans
Wizard Zines (1)
Head First iPhone & iPad Development
Brett McLaughlin & Tracey Pilone & Dan Pilone & Paul Pilone
Software Design Decoded
Marian Petre & André van der Hoek