Online PowerShell help
One of the reasons I dump the file files to text files is that I am frequently in a position of being on a customer site without direct Internet access. If I have the files available then I can solve the problems.
If you have Internet access then the help files are available on line at http://technet.microsoft.com/en-us/library/ee307956(WS.10).aspx
PowerShell 2 help files are online at http://technet.microsoft.com/en-us/library/dd347701.aspx
One advantage of using the online help files is that this is the place documentation errors will be rectified first