See the test:
http://econsultancy.com/uk/blog/6239...e-case-studies
The first test is really interesting, I liked that a lot. However the following two tests aren't really fair, there are so many other changes on the lander that make the results kind of irrelevant.
Good point Lorenzo. Funny that a "consultancy" company doesn't do proper A/B testing...one variable at a time.