I’ve written before about strategies for avoiding A/B tests. The most important one is just to do your homework, and take advantage of the huge number of documented usability and conversion rate optimization studies that are already out there.

I’ll update this post with more sites that I find matching this description.

• Nielsen Norman Group. A lot of their content is paid, but much of it is free, too. Their blog, which is under the “Articles” section of the site, is great weekly reading, and of course, extremely easy to understand.
• Marketing Experiments. Huge number of videos and articles, and a research archive with extremely detailed testing results.
• Which Test Won?. Huge library of A/B tests, specifically. I can’t resist taking their “Free Test of the Week”, where you have to guess which of two variations performed better. Great check on your abilities as a marketer, frankly.