A/B testing is one of those things that, as an engineer, for me it's very tempting to just write it myself. I've tried a couple of solutions:

- Split Test Accelerator may actually have been written by a monkey who was accidentally taught PHP, judging from the code.

- Google Web Optimizer seems to have been written as an afterthought, judging from the simple nature of the tools you get. When I last used it, it was actually just Javascript which you include, that on loading it simply does a search and replace of elements. Sure, it gets the job done, but as a somewhat savvy user, that approach doesn't leave me feeling confident in it.

I don't know what mechanism Optimizely uses to execute tests but it seems similar to the Google way -- which I admit is the only way I could think to do remotely hosted A/B testing like this. Optimizely looks a little better in that they host the assets you might want to test.

I welcome anyone who wants to build a solution that doesn't seem like it's bolted on.