A while ago I came across Doblin's "Ten Types of Innovation" model - although it is by far not perfect, it provides a really neat, concise way to look at (and evaluate) innovation. The way Doblin's model works is: For each innovation (project) you check them on each of the ten factors of the model (which fall into three broad categories: Configuration, Offering and Experience). Essentially you then make a binary decision - does the project innovate on the profit/business model? Does it innovate on the network? etc. The more boxes a project ticks, the more innovative and disruptive it will be. Clean, clear and easy. Not perfect - but usually good enough.
Harvard Business Review published an excellent infographic on the model and its application and if you like long(er) form content, the W.F. Kellogg Foundation has published a paper on "Intentional Innovation" (in the context of philanthropy and social impact".