I agree with the other comments saying that your home page doesn't describe your product clearly enough. I disagree that showing a video is the best solution. As a user, I don't want to waste my time watching a video until I'm convinced that I want to investigate further. Instead, I would put a Top 5 showcase of some great looking plans on the home page. This also gives an incentive for the users to create something that is really cool, so they can be featured on the home page.

I think relying on Facebook Connect only might be a bit iffy, unless you absolutely require it for core functionality. In your case, Facebook adds some social elements but the core competency of your website is building plans. I might want to sign up to play with your site without using my Facebook account. If I like it enough to recommend it to my friends, I might be willing to link it to my Facebook account later.