Optimizely is an idea that should have come to fruition a long time ago. Founded by a couple of ex-Googlers (Xooglers), Optimizely helps you optimize your site by simply showing some of your customers random versions of it (slightly different) and helping you ensure that the bulk of your visitors see the best site possible. They cut their teeth optimizing the Obama election sites… i guess they did ok since they helped raise buckets of cash for him. Check out Optimizely: A/B Testing you’ll actually use