Free eBook - Windows PowerShell v.1 TFM
SAPIEN Technologies has released their Windows PowerShell v.1 TFM eBook (18.4 MB), by Don Jones and Jeff Hicks, as a FREE download on their community tools page, 
!. The book was one of the first PowerShell books on the market and is a great resource to learn PowerShell.
The second PowerShell book in the TFM series,Windows PowerShell v.2 TFM, covers all the new features and technologies of PowerShell v2.0 and can be pre-ordered.