I do not know if you read the following articles by me about investing, they touch some business model discussion, if not, it may be a good read:
http://web.wenxuecity.com/BBSView.php?SubID=tzlc&MsgID=31536
http://web.wenxuecity.com/BBSView.php?SubID=tzlc&MsgID=32084
I am not really sure what you are asking, if you are asking for business model for individual stocks, then I will spend some time to talk about some stocks that I am familiar with. Otherwise first link talks about good business models in general.