BizTalk Server books are in short supply.  And finding one that really helps solve real world problems is event harder to find. 

A new BizTalk book is now available.  It's called BizTalk 2006 Recipes and is currently available on for around $38.

I was fortunate enough to get to work with the authors of this book as a Tech Reviewer. This book covers BizTalk from end to end and is a must have for any BizTalk project!