Over on Semicolon, you can find a very interesting plugin, and a feature that I think would be a great addition to a default plugin for WordPress to add.
Search Meter is a WordPress plugin that helps you keep your blog focused on what your visitors want to read. It does this by keeping track of what your visitors are searching for.
If you have a Search box on your blog, Search Meter automatically records what people are searching for – and whether they are finding what they are looking for. Search Meter’s admin interface shows you what people have been searching for in the last couple of days, and in the last week or month. It also shows you which searches have been unsuccessful. If people search your blog and get no results, they’ll probably go elsewhere. With Search Meter, you’ll be able to find out what people are searching for, and give them what they want by creating new posts on those topics.
You can also show your readers what the most popular searches are. The sm_list_popular_searches() template tag displays a list of recent popular successful search terms on your blog, with each term hyperlinked to the actual search results.
Search Meter installs easily and requires no configuration. Just install it, activate it, and it starts tracking your visitors’ searches. Here’s a screenshot of the administration interface, showing the reports you’ll get. Click the image for a full-size view.
So if you are curious what your users are searching, or want to show users what are popular searches, check out Search Meter.