My earliest forays into writing powershell for SQL Server found me scrambling for help. I found several resources online that covered some specific topics, but I still had trouble finding what I needed.
Ultimately, I found a lot of great articles on one of my old haunts Database Journal. I used to be regular on Database Journal. I posted some of my earliest articles there and am still a moderator of some of the forums there. I got a lot of help from some articles written by a fellow dba and Database Journal regular Muthusamy Anantha Kumar aka "The MAK". I got some additional help from articles written by another Database Journal regular that I didn't know as well, Yan Pan.
I decided to check out Amazon.com to see if they had any books on powershell for dba's and learned that MAK and Yan Pan have collaborated on a book on this subject. Based on the articles I have already read by MAK and Yan Pan on Database Journal and from already knowing the depth of experience and knowledge that MAK brings to the table, I pre-ordered a copy for myself. I think it will become an essential book for anyone that uses powershell for database administration.