Several people who attended my PowerShell talk at SPC09 have been asking for the “Start-Demo” Script I used to demo PowerShell commands without having to type them in front of a live audience. The script I used is really just a slightly modified version of this one http://blogs.msdn.com/powershell/archive/2007/06/03/new-and-improved-start-demo.aspx — i recommend just using the version provided by the PowerShell team.
Also, I recommend pairing this with the Sysinternals tool ZoomIt to allow for zooming and underlining elements on the screen. This is a free tool available from the Sysinternals website: http://technet.microsoft.com/en-us/sysinternals/default.aspx
Zach Rosenfield's SharePoint Blog 