Ask HN: How do you get into A/B testing?

Basically every time I read what Patrick writes on HN or Kalzumeus, I really want to get into A/B testing. I want to collect data and make changes based on data and figure out what worked and what didn't and hypothesize on where to go next. Coming from a web design background, the degree of objectivity fascinates me.

But none of my side projects have enough traffic to A/B test. And that's the problem.

I doubt that most people A/B test their web sites. It seems like there's a market here. Does anyone have a tip or two for breaking into it?