Have you seen this?? What a great tool!
It allows you to enter specific learning goals along with level of thinking, content, resources and groupings. It was developed by a teacher who began keeping track of his differentiated lessons and in his words, "The Differentiator was born". Here is a link to his blog. http://www.byrdseed.com/
Playing around with this tool during the summer would be well worth your time. I would also suggest checking out his blog. He is focused on gifted education, however all of his ideas can be used with general education students as well.