I have been using Crowdbooster since last November (no serious reason, just felt like betatesting another YC startup) and until like two days ago when they improved their graphs a bit I honestly thought they are dead. In the last four months the website pretty much did not change at all.

Here is a suggestion. Maybe you can work on improving communication with your users so they know what is being changed and added to the site. I just checked out the blog for the first time like a minute ago and only once is a new feature mentioned (the #FF feature from 19 days ago). All the other entries seem to be focused on 'we are mentioned here! and we are mentioned there!'. Since I do not even read the blog, I even missed the #ff feature.