RocktheVote.com makes it easy to register to vote, and it also helps you find your polling place and important dates. Sign up for email reminders, learn who is on the ballot for your area, figure out voting as a student, learn the ID requirements for your state, and more.
"Vote Smart's mission is to provide free, factual, unbiased information on candidates and elected officials to ALL Americans." Offers profiles of 40,000 politicians and a "vote easy" tool to find the candidates who best match you on the issues.
Useful for comparing candidates' stances on various issues. You can browse by politician or by issue. Each politician's profile breaks his/her record down by topic and includes pertinent past statements and the candidates' voting history on the issue. Coverage can be spotty in between presidential elections, but still a valuable resource.