I don’t like the data detectors that Apple added to Mail in Leopard, because I never use them and they interfere with selecting text. I just figured out that you can disable them by entering defaults write com.apple.mail DisableDataDetectors YES in Terminal. Normally this type of hidden preference would be easy to look up in Google, but I only found a bunch of ideas that didn’t work, and as of this writing there are zero hits for “DisableDataDetectors”.
Update (2013-04-16): Alas, this no longer works in Mountain Lion.
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