This is a fairly complete list of places where I have given invited talks. 

2007-2008
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University of Toronto, June 2008

2006-2007
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ICON conference (keynote), January 2007

2005-2006
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Stayed home!

2004-2005 
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Thomson West Publishing, June 2005
Yahoo Search Marketing, May 2005
AIDA Symposium (UMD), April 2005
Educational Testing Service, Jan 2005
Northern Illinois University, Oct 2004

2003-2004 
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University of Toronto, Oct 2003

2002-2003
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University of North Texas, April 2003
CICLING conference (keynote), February 2003
The Mayo Clinic, Dec 2002

2001-2002 
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The Ohio State University (Computer Science), April 2002
University of Minnesota, Twin Cities, April 2002

2000-2001
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The Ohio State University (Cognitive Science), Spring 2001

1997-1998 (while a grad student at SMU)
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University of Minnesota, Duluth, March 1998
California Polytechnic State University (SLO), March 1998
MITRE, Spring 1998
Center for the Study of Language and Information (CSLI, Stanford U), Feb 1998
Gettysburg College, Spring 1998
Catholic Universiy of America, Spring 1998
Wright State University, Jan 1998 
Hofstra University, Fall 1997
Illinois State University, Fall 1997