Embedding code snippets in iBooks Author
There is a way more simple way to do this... I'm using iBooks Author 2.0 it has a "Paste and Retain Styles" option that works like a charm.

I edit the code snippets in Xcode then select and copy the section I want:


Then control click where I want to paste it into my book:


Done! The snippet is included with syntax highlighting:


Pro Tip 1:
Take time to set up Xcode to use the font you want so you don't have to fiddle with it once the code is pasted into iBooks Author:


Pro Tip 2:
Here are some other useful settings for your code snippet paragraphs, keep the lines together and disable auto-hyphenation.