So you know, the rollover issue isn't browser specific - I'm using IE6 & Firefox. There is some glitch in the flash itself that isn't makig it work properly. When you hover over one of the links and move side to side over it, it starts to work for the most part. You may want to have your designer look into that.
To me, the "Free Trial" button you have just doesn't seem to fit with the overall design of the site. Same with the "Order Now" button on your plans page. They just seem a tad clunky and don't fit well with teh overall design.
The last thing you might want to consider is making the flash header so it doesn't reload on every page. In my opinion, when you go to a subpage the menu and graphics up top should remain where they were after they loaded up on the main page.
All in all I like the look of the site. Those are the only things I would consider changing but I'm picky when it comes to designs. Good job on the site.