I think your app suffers from the same problem my startup app has, which is the empty canvas problem. So basically your app seems to allude to a lot of power and functionality, which is paradoxically a little intimidating for a new user. Basically, where do I start? You have a lot of choices in the "what do to next" section.

What happens a lot of the time is the user says:

Wow! what a cool application! Seems powerful! I'll deal with this when I can properly think about it!

...and then promptly never visits your site again.

Somebody from Skype told me that they had the same problem and their solution was to funnel all users into a 5 step program. I would suggest that you "onboard" your users by forcing them into a N-Step workflow where at the end of it, it doesn't look like an empty canvas but a starting point to contribute more.

Edit: Like step 1 should be "Invite your SO". Encourage them to collaborate and plan together :)