I just spent some time browsing the questions on the Yahoo! Answers site and as usual Yahoo! shows that they get it. They may build unspectacular user interfaces but they know how to build useful software for users of the World Wide Web.
I find this to be an interesting experiment in providing alternatives to traditional search engines for answering people's questions. Unlike Google Answers, there is no payment required from the person whose question is answered. This raises the question of why anyone would want to answer questions on the site. Whuffie?