Best practices for A/B testing?

What do you guys use for A/B testing with WordPress?

Knowing that WordPress has plugins for everything, I went looking for A/B testing plugin and didn’t find any.

It also looks like http://optimizely.com or similar solution may work together with WorpdPress. But I would much rather prefer managing everything in a single app.

Any ideas/suggestions?

This is not a straight WordPress solution but I would recommend a/b testing feature found in the Google website optimizer. http://www.google.com/websiteoptimizer/b/index.html.

It works with your analytics account. You just need to create two (or more) pages in WordPress.