Exploring Yahoo's Web Site Design, Usability Data, Etc. Resource
"Yahoo has exposed their testing results on issues ranging from ratings and reviews, reputation, navigational structure, ad placement layouts, bead-crumb navigation best practices and wire-framing tools," he says. "In my past experience, I have spent considerable time searching for this grade of information and have often paid for best practices based on valid testing. Now it's free."
For example, Yahoo has tested a number of reputation monitoring tools and has posted the results in the Developer Center, including case studies as well as precautions. Gold also suggests tapping the Yahoo User Interface (YUI) blog for more design and usability info.