1. I would avoid the current color scheme you're using. I'd pick something with a bit more color, but keep it muted. Right now, the first thing I notice is the color scheme and not what the product is/does.(Also, as it stands, your button colors do not match the overall scheme of the project right now.)
For this, use kuler.adobe.com to pick a color scheme and run with it on all your pages.
2. The layout leaves a bit to be desired. I'd start with a big picture of your main app screen, the title of the project, and then a 1-2 sentence summary of what your product does/solves and keep it all above the fold. Have a nice big sign up/pricing button. Some examples to get you started can be kippt.com and jumpstartui.com.
I hope these help you a bit! As always, you have no obligation to listen to me. :)