Too bad you need to build it for ASP.Net, I just did it for Windows Forms. See http://www.emoreau.com/Entries/Articles/2008/02/A-Wiki-based-help-system.aspx

>Good morning,
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>My user wants for me to add a HELP button to the application with the ability for them to create their own help. My idea is to give them a template of an simple/empty HTML file. They will populate this HTML file with their HELP text and I will bring it up on the click of the HELP button.
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>Can you think of a better approach to do this?
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>Thank you.