The following resources are a combination of videos, ppts, e-books, scripts, examples etc.
There are some good learning resources here:
http://technet.microsoft.com/en-us/scriptcenter/dd793612.aspx
https://gallery.technet.microsoft.com/scriptcenter -> Working scripts examples
http://technet.microsoft.com/en-us/library/hh847741.aspx -> Commands overview
http://ss64.com/ps/ -> A always handy bookmark site :)
http://social.technet.microsoft.com/wiki/contents/articles/4307.powershell-for-beginners.aspx -> sides have some good resources.
http://powershell.com/cs/blogs/ebookv2/default.aspx -> e-books
http://blogs.technet.com/b/heyscriptingguy/ -> Scripting Guy blog.
http://powershell.com/cs/blogs/tips/ -> PowerTip on PowerShell.com for daily dose of tips:
http://it-ebooks.info/tag/powershell/ -> E-books
Scripting with Windows PowerShell
http://technet.microsoft.com/en-us/scriptcenter/dd742419.aspx
Windows PowerShell
http://technet.microsoft.com/en-us/library/bb978526.aspx
TechNet Magazine: Windows PowerShell
http://technet.microsoft.com/en-us/magazine/cc135920.aspx
https://technet.microsoft.com/en-us/scriptcenter/dd742419?f=255&MSPPError=-2147217396 -> Windows PowerShell Scripting
https://www.idera.com/productssolutions/freetools/powershellplus -> Tools.
http://powershell.com/cs/blogs/ebookv2/archive/2012/03/20/chapter-13-text-and-regular-expressions.aspx -> RegEx starting reference.
Videos::
To learn about PowerShell check out the courses at the Microsoft Virtual Academy.
Getting Started with PowerShell 3.0 Jump Start
http://www.microsoftvirtualacademy.com/training-courses/getting-started-with-powershell-3-0-jump-start
Advanced Tools & Scripting with PowerShell 3.0 Jump Start
http://www.microsoftvirtualacademy.com/training-courses/advanced-tools-scripting-with-powershell-3-0-jump-start
https://www.youtube.com/user/powershelldon/playlists - Don Jones Playlist
Happy Learning...
- Also the Technet PowerShell Survival Guide got a ton of good links
- Ebooks from PowerShell.org: Examples: The Big Book of PowerShell Gotchas, The Community Book of PowerShell Practices, DSC Book, etc...
- Monthly PowerTips from PowerShell.com: Examples: File System Tasks, Array and Hashtables, Date time, Registry, Functions, WMI, XML, etc...
- Subscribe to the Daily PowerTips newsletter for PowerShell.com
- The "Month of lunches" series books.