The little green men are out there!
http://www.nuforc.org/webreports.htmlThis could actually be a fun dataset for an undergraduate project: we have (roughly) geolocated descriptions of UFO sightings, so it could be used for a number of things including the kinds of language and terminology differences across different parts of the US with respect to a very narrow domain.
Oh, and don't forget that UFO means unidentified, not "alien spacecraft." :)
Happy Turkey Day to y'all!
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Jason Baldridge
Assistant Professor, Department of Linguistics
The University of Texas at Austin
http://comp.ling.utexas.edu/people/jason_baldridge