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Along with the study, the team at Penn State have a new released a new database named BotSeer and made it available to the public. "BotSeer is a search engine for robots.txt. Its goal is to provide information about and access to robots.txt files throughout the web by crawling and indexing web robots.txt files and related documents. In addition, statistics about favored robots, comments and robot behavior is analyzed and presented."
In regard to the quote at the end: why would people go out of their way to specifically block MSNBot? MSN Search is hardly the best engine around, but people do use it, and I cant see a reason you wouldnt want MSN to index you.