My team is looking at Windows Workflow for our next project. We'd like to buy a book about it. Which books do you recommend?
One book per answer. Link to Amazon (or similar, but at least include the ISBN).
Vote up an answer if you liked the book. Comments about why you liked/disliked the book are welcomed.
Not Windows Workflow 4. We're not ready for that yet.
Not sure why the question has been asked in the way that it has - but I found WF review informative and quite amusing in places
Foundations of WF: an Introduction to Windows Workflow Foundation
by Brian Myers, Apress, ISBN: 978-1-59059-718-7
I liked K.Scott Allen's "Programming Windows Workflow Foundation: Practical WF Techniques and Examples using XAML and C#".
I didn't like Essential Windows Workflow Foundation. (Since it's not a recommendation, I'm not breaking your odd request!)