Microsoft's Windows PowerShell team announced the release of new Windows PowerShell 2.0 Core Help -- May 2011 Update in CHM format.
"The newly released CHM includes Windows PowerShell Core cmdlet help, provider help, and conceptual "About" help topics as of May 1, 2011. It's digitally signed and packaged in an executable file to ward off the meanies," Powershell team stated.
Note: It doesn't include help for all of the wonderful modules that you can use with Windows PowerShell, but it might get you through the next long airplane ride, dentist visit, or power outage.
"The best way to get updated help for Windows PowerShell core commands is to type "Get-Help - Online <cmdletname>," but that works only when you're online and your firewall permits Internet access. For all of those other times, there's the new Windows PowerShell 2.0 Core Help - May 2011 Update in CHM format."
You can get it from the Microsoft Download Center.
[Source: Windows PowerShell Blog]