OK, I mentioned Sean Liming's new book, Windows XP Embedded Supplemental Toolkit, in a previous post. I just got my copy of it today, and it looks good.
Sean's covered most of XPE SP2, and relied heavily on the Embedded community to give him pointers, tips, and info. The updated Tips and Tricks from Embedded's own Lynda Allen are worth the read in and of themselves (ignore the MS ID numbers - they're just SQL ID fields and mean absolutely nothing to anyone). And the tools are worth the price - heck, Component Tracker alone is worth the price (it gives you all sorts of cool info about a component, like a list of dependencies and what depends on the component). Highly recommended - check out Sean's website for more details.
I don't know how good a reviewer I can be, but as I read it, I'll dump my thoughts here.