Just me, or does anyone else miss Multivariate testing? It's impossible for me to use A/B testing with shopping cart software when it loads dynamic content (like the cart or checkout processes). Unless I'm doing it wrong?
Content that loads dynamically won't force you to use Multivariate Testing. In fact, most commercial services implement both A/B and Multivariate tests using client side JS.
Also, you can A/B test dynamically loading content so I think you just need to find out how to do it using your chosen software.