In a recent blog entry she reviews IronPython in Action:
Overall, I would recommend IronPython in Action for anyone wanting to learn IronPython. The examples in this book were easy to follow and very applicable to everyday programming. Even if you're an experienced IronPython programmer, IronPython in Action would be great to have on hand as a reference. I'm looking forward to buying the final copy once it comes out, just to have as a reference (and to plug in my future IronPython talks).