Via TUAW:

Apple has recently put a number of Apple Developer Publications books into the iBookstore for free.

The titles are:

• The Objective-C Programming Language
• Object-Oriented Programming with Objective-C
• iOS Technology Overview
• iOS Application Programming Guide
• iOS Human Interface Guidelines
• Cocoa Fundamentals Guide

Perfect reading to have during a commute, while standing in line, while loafing at Starbucks, or even on an exercise bike or treadmill.

We've come a long way since Inside Macintosh!