I just got a Google alert showing where I could download a free copy of the Windows PowerShell Scripting Guide. However, the download contains a Trojan!
Be careful and avoid http: //download-apps.net/2008/11/28/windows-powershell-scripting-guide.html.
Thanks to Halr9000, who noted that Blogger had "helpfully" added in a hyperlink to the above content. Hyperlink now gone.