New and improved version 2.0: http://earlyvoting.net/calendar/index2.php
(Thoughts on how this compares to version 1.0 (earlyvoting.net/calendar) are appreciated.)
A shout out to Richard Wolf of the USA Today for getting us moving on this page. For reporters, there is a downloadable spreadsheet with the same dates; we only ask you cite the source if you use the data.