We've written a program (that unfortunately only runs on Windows) which will show you what the eclipse will look like from any location you can enter the coordinates for (in the mainland US). Some cities are already programmed into it as well! To use the program, download this zip file, and unzip to one directory. The ocx file should be in the same directory as the exe, and you'll be good to go.

Here is a Google Earth animation of the eclipse shadow sweeping across the United States.  You should have the latest version of Google earth installed to use this.  Just download and unzip it - you will see a KML file that can be directly opened in Google Earth.