I always get annoyed at the call-to-action button being placed above the descriptions of what I get. I want to see what I get before I sign-up, and you're making me scroll down below to fold to try to see what I need to know, then I need to come back up to the button.
I wouldn't have the "Sign Up" button on the front page like that. I'd have a careful and considerate but above all short description of the aspects of the features - I've chosen my wording carefully there - that leads me on to ask natural questions, that then get answered.
There's a reason why these shopping channel pitches always say "But wait! There's more!" until they finally have you screaming "YES - BUT WHAT'S THE BLOODY PRICE!!!" They get you engaged and committed before asking for actual action.
And those were my immediate thoughts.
Also, what's the point is using valuable landing page real-estate to put the name of the site with a link to the same page? I refer to the lovingly designed logo/name at the top left.
I'd say you need to lose half the words, tighten the layout, remove half the graphics, and lead me through some pages showing the benefits, each with a subtle call-to-action button that gradually gets more prominent.
But I'm not a designer. I would be interested to see other people's responses to this critique.