States' deadline dates: registration, early voting, absentee ballots + links to official election sites - National Association of Manufacturers
State Voter Registration and Absentee Information - Project Vote Smart
Choose one or more criteria in a single state or one criterion in one or more states - Vote411.org
Statewide Absentee and Early Voting Laws - Early Voting Information Center
Absentee ballots for Americans - Vote from Abroad, Absentee Ballots for Americans
Language accessibility program - U.S. Election Assistance Commission
Overseas Voter Resources - Overseas Vote Foundation
Information for Uniformed Service Members, Their Families and Citizens Living Outside the U.S. - Federal Voting Assistance Program
Provisional ballot verification (8/07) - Pew Center's electiononline.org