- More white space. It's the easiest way to lose the "cluttered" feel of having giant blocks of explanatory text.
- Vary the fonts and font sizes. In particular, your nav. bar's font sizes are too big and distract from the section titles; you can lose the nav altogether for a landing page.
- Have a consistent coloring scheme. Pick 2-3 colors (maybe the ones from your logo) and stick with them: one color for the titles, one for links, one for text. E.g., using light purple for your secondary title text at the bottom makes them look like links.
- Make the "sign up" button stand out more. That's your call to action, and right now it blends in with the background.