I reported back in June HERE that I was reviewing a book for Sapien. Well, the NDA is over and the book an my involvement is announced HERE. The book is the 2nd edition of Sapien Press' PowerShell: TFM book.
I reviewed about 150 pages of the book on the more advanced concepts, and I think the content overall is great. This 2nd edition have many improvements over the 1st edition.
Don and Jeffery also already have a early release version of a 3rd edition covering the PowerShell 2.0 CTP!