An ebook called "A Jump Start to SQL Server BI" is available at
http://www.windowsitlibrary.com/Ebooks/sqlserverbi/Index.cfm
I’ll admit that I’ve not read it thoroughly, but after a quick skim the content seems to be a bit all over the place; still, there’s some interesting stuff in there if you look.
Looks like this book is simply a collection of articles published in SQL Server Magazine.