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Tomorrow morning, social media and marketing researcher Dan Zarrella is debuting a new way to see into the minds of Twitter users by analyzing their most recent 1,000 tweets.

TweetPsych uses two linguistic analysis methods to build a psychological profile of a person based on the content of their tweets. It compares the content of a user's tweets to a baseline reading Zarella built by analyzing over 1.5 million random tweets and shows the areas where that user stands out. It also reminded us of two other fascinating apps that show how long a user has been on Twitter and with whom they hold most of their @reply conversations. Being socially minded journalists, we've made bookmarklets for all three services.