So far, I'm done about half of Professional CodeIgniter by Thomas Myer. As you guessed, it's about the php, MVC framework CodeIgniter. While I've spent a lot of time online at the documentation, tutorials, etc., I'd preferred to grab a book on it (the only one I could find that's available) to get a more formal introduction.
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"Getting Real" by 37 Signals is a very specific read, for a very specific audience, but it does a tremendous job outlining a different approach to web development. That approach revolves around getting something 'real' out, usable, and able to gain traction. This is the strongest point that is made repeatedly, very similar to a Seth Godin read which constantly reiterates the same point, over and over again, until it's become clear.
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