We had 6.5 million free uniques per year and ~200 paid customers on a freemium model and went to free trials / $279/yr.

Revenue almost tripled YoY.

I wrote about it here: http://wensing.tumblr.com/post/26830276239/bootstrapping-sto...

And you can watch me talk about it here: http://mixergy.com/matthew-wensing-stormpulse-interview/