http://powershell.com/cs/blogs/ebook/
Gotta love a freebie.
You can download the complete Powershell reference/tutorial as a PDF or read it as HTML online.
Here is the table of contents:
- The PowerShell Console
- Interactive PowerShell
- Variables
- Arrays and Hashtables
- The PowerShell Pipeline
- Using Objects
- Conditions
- Loops
- Functions
- Scripts
- Finding and Avoiding Errors
- Command Discovery and Scriptblocks
- Text and Regular Expressions
- XML
- The File System
- The Registry
- Processes, Services, Event Logs
- Windows Management Instrumentation
- User Management
- Your Own Cmdlets and Extensions
I haven’t read it yet, so I can’t offer an opinion, but it looks good at first glance.