The newly revised version of the Hulu Plus software now uses a tray style format with a better and more colorful experience. In addition, the software gets improvements in the recommendations and viewer history lead to a better overall experience.
One thing that has not changed is the price. That might be the one thing that Hulu needs to change for the Plus version to gain more folks subscribing to it. Hulu Plus could also use more content which would also be helpful in getting subscribers.