Here's some more information on the spatial spread project.

Abstract.

Talk given at the Ecological Society of America 2008, Milwaukee WI, August 2008.
ESA2008 5.1MB - zip file. 15 min powerpoint presentation. Turn volume up to hear narration.

Talk given at the Ecological Society of America 2007, San Jose CA, August 2007.
ESA2007 6.3MB - zip file. 20 min powerpoint presentation. Turn volume up to hear narration.