I somehow stumbled across Tag, which is a software agent by Keith Frank, Alex Galloway, and Jon Ippolito of three.org (an outgrowth of the Distributed Creativity project, like Wikipedia, Blogdex, and a bunch of others).

"When readers view messages on the Distributed Creativity home page, they see a header like this attached to every e-mail in the forum; each index is accompanied by a descriptive word or bar chart to indicate the relative "strength" of that assessment. These strengths are based on statistical analyses of the e-mail message itself:

• The JARGON index measures the frequency of academic jargon such as "conflation" or "corporeality" or by the use of Latinate endings such as "ization" or "ism."
• The HIPNESS index measures the frequency of buzzwords suggesting fashionable artistic or technological trends, such as "blogging" or "open source."
• The NAMEDROPPING index measures the frequency of Important Theorists and other household names in art and technology cited in the message.
• The HEAT index measures the frequency of inflammatory, sexual, or curse words, or exclamations and words in ALL CAPS.
• The CONNECTIVITY index measures the frequency of urls cited in a message.
• The LIFESPAN REDUCED BY index measures how many seconds it will take to read the message.
• The PONDEROUSNESS index measures the average number of words per sentence."