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Dan Zarrella has long impressed us with his discourses on the science of retweets, as well as his psychoanalytic apps that scan and parse Twitter streams - one for general analysis and one for dreams.

His latest project, TweetPsych for lists, is an enlightening and often amusing look at what your lists are talking about, how they view the world, what turns them on (or off), and more. Depending on how you group your Twitter friends, you can make interesting generalizations or conjectures about society as a whole. What do the denizens of L.A. or San Francisco tweet about most? What about women - what's got them buzzing? Read on for more on precisely that cross-section of the Twittersphere.

Social media scientist Dan Zarrella, creator of pop-psych Twitter app TweetPsych, has put together a new tool for analyzing tweets about dreams.

Dr. TweetDreams pulls together elements new and old, including symbolic meanings from a 100-year-old dream dictionary and any and all tweets containing the phrase "had a dream." "I finally got to use all my cool natural language code," Zarrella told us last night. "I'm using a part-of-speech tagger, a wordstemmer, and Princeton's WordNet to generate a list of related word stems which are then matched against a dream dictionary."

At Social Media Camp 2009, Dan Zarrella of HubSpot gave a well-attended presentation about the etiquette and very real-world value of retweets. Although every power user's ego heart swells with pride with each of these 140-character validations he receives, the small- and medium-sized business owners using Twitter for marketing have a much more tangible interest at stake.

There are Twitter Terms of Service that help dictate how content is shared, and there are generally accepted community guidelines for attribution. Zarrella shared his researched insights on how to get more retweets and leverage Twitter to increase mindshare and drive traffic. He also talked about the value of Twitter as compared to other social networks in terms of conversion.