MTKeywords is a Movable Type plugin that compiles a list of fairly relevant keywords from the aggregate of the body of an entry, its title, and its comments. While the default purpose of the entry's Keywords field is to populate the page's Keywords meta tag, I found that extra data entry field to be most advantageously used for other purposes. Plus, there hasn't been a way to auto-generate a list of relevant keywords. Thus, MTKeywords was born!
MTKeywords is a Movable Type plugin that extracts keywords automatically using bigram algorithm.