My only suggestion is this:
Clearly define your transitions. For example, place headers in your content (graphic headers, text with a background color, etc). Do this in places you want your surfer’s eyes to land on. Right now, there is so much content on the homepage (text) that I would not want to read it. If there were transitions of some sort (headers… or even boxed content), the surfer could quickly get the information he/she wanted and read that.
My guess is you have a lot of 5 second surfers.