Early Voting Data at United States Election Project

A great resource for secondary data on voting and elections is Dr. Michael McDonald's United States Election Project website at George Mason University. It includes data on turnout trends, voter registration trends, early voting, etc.

A recent post provides data on early voting in all 50 states for the 2008 election and in some cases provides the demographic and party breakdowns for early voters. A great resource for political junkies.