Dedicate a defined portion of your Web team hours to search. The amount of resources assigned would of course depend on the size of the site, the frequency of new content being added. Very often, we set up the search engine, do some initial tuning and testing, and then just let it run. Its important to periodically review search results on your site, review the top searches on your site and provide insights to content owners. That only happens when you make search a priority for your Web team.
Idea No. 255