As was mentioned before by someone on your blog back in March, this plugin breaks the normal search. I noticed my search wasn't working, but didn't know when exactly it stopped working. So I installed a brand new WordPress (2.8), in a different subdomain, using a brand new database. Everything worked. Then I added the plugins I am using on my regular blog, and search didn't work. Deactivated all, enabling them one by one, each time testing the search. When I enabled your plugin, search stopped working. To make sure it was due to your plugin, I deactivated all plugins but yours. Search still didn't work. I am using permalinks, with a structure of /archives/%year%/%monthnum%/%day%/%hour%.%minute%.%second%, a category base of archives/categories and a tag base of archives/tags. I'll test whether the problem remains, when using no pretty permalinks.