That's the wrong way to do this: you're basically asking him to go through your skills, then go through his business and find where they intersect so you can help him. It's take away one of his most important resources, time.

Instead, research everything about 37Signals and Starter League (example: http://charliehoehn.com/2009/01/08/how-to-hack-someones-mind...), come up 3 ideas that benefit them, and pitch them as someone who will get it done and they won't have to manage. When contacting busy people, you'll get far better returns with this approach.

I'd go into more detail, but Charlie already wrote the roadmap for doing this: http://www.youtube.com/watch?v=e5qUR3tpEdA