MyTwitterWeighsATon

Description:

MyTwitterWeighsATon analyzes and counts related words in your Twitterstream to determine what you’re tweeting about the most. The process relies on grouping similar words using the Porter Stemming algorithm. This process reduces words to a common root, allowing the service to identify similar words like “fishing”, “fished”, “fish”, and “fisher”.

Although the creator of the site considers this "mostly pointless", but it is sometimes interesting to see what a Twitter user is mostly talking about.