Would you be interested in this web app help product?
pedalpete: I think you need to still sort out what you are offering/selling. 
Rarely does 'I want to make a...' turn into a business.
Come at it from the other direction. 
'People need ..., I can serve this need with...'.If websites need help sections, is the best product a 'help dialog box plugin'? 
How would you answer the help questions?
Are you just providing a UI element? If so, what is that truly worth, when full suites like jQuery UI exist?