This is the deck that I used at my presentation to the NEBytes user group last night. The audience was mixed IT pro/developer; 1/4 people who have used PowerShell to some degree; 2/3 had at least some awareness. The aim of the presentation was to show existing PowerShell users some of the exciting new features/directions, and persuade the rest that PowerShell has come of age and is a technology that they should be exploring.
At the end there was a discussion about books to help you get started with PowerShell. There are some really good books out there, but to reduce the cost of entry, I'd suggest you start with some free ebooks. You can check out this post which links to some resources, and you may also find PowerShell cheat sheets useful (I did when I was getting used to the syntax). Also, look out for announcements around the public availability of the Microsoft Script Explorer for Windows PowerShell.
I also asked whether anyone would be interested in a North East (England) PowerShell Script Club? I want to discuss with those who might want to take part about how they'd like it to work for them, but one idea is to meet for half an hour before the normal NEBytes meetings so that we can share challenges we've faced or successes we've had, with the aim that we all get better through sharing our experiences. If that's of interest to you, drop me an email to jonathan at nebytes.net or @jonoble on Twitter.