Any way to split-test pages from Organic Traffic?

Hey everybody-

I'm looking to split-test the layout of my pages to see which converts more. I'm using wordpress and would really like to have a plug-in that switches themes and keeps track of the conversions somehow.

I know you can do split-testing if you are buying the traffic from Adwords, but can you do it will just organic results too?

Thanks,

Brad

 

I want the answer to that question aswell.

 

you can use google webmaster tools to do a A/B Split test for organic traffic