PowerShell v2 provides graphical help system that includes the cmdlets, the about files and and the User and Getting Started Guide.
The default locations on the Start Menu for PowerShell are Accessories – Windows PowerShell. In these locations the help files are not visible. If you open up ISE then you can access the help file.
Pinning PowerShell to the start menu on Windows 7 provdes access to the help through the recent files menu – help file is located at %systemroot%\Help\mui409\WindowsPowerShellHelp.chm