By pure coincidence, in the past couple of days I’ve picked up links from a couple of my Associates, both pointing to the Business Model Canvas.
Miriam Gilbert has provided a modified Business Model template (pdf) which you can download and is shown below. The original Business Model Canvas (pdf download) is here. The other link was provided by Rod Willis.
This reminded me of a (simpler) Service Delivery Model template I created to use with some public sector clients who were looking at alternative ways to deliver their services. Admittedly, the Business Model Canvas includes far more elements required to define a business (such as resources and cost structure), but I believe you have to start by thinking about customers and the value you can add in different ways. My template is below.