Weblog Tools Collection has an advanced contextual search hack which provides an intelligent search engine for your WP weblog. This hack features text based “fuzzy” searches within WordPress, a nice Google like interface which is very customizable, search results with decreasing relevance to search topic, a trap for words which are less than four letters long, “Next results” button which shows the next 10 (or less) results in relevance, and a very simple installation with no effect on future upgrades.
