This is a diary of links. For anybody trying to find their state board of elections (or similar body) on the web, this diary is for you. Most, if not all, of these sites can help you find your polling place, let you see a sample ballot, let you see any other propositions that are on your ballot, etc.
(Please note: Some of these links are to .com sites rather than to .gov or .xx.us sites; these links are linked to from official state government sites and I encourage you to verify that by going to the official state government website for that state if you have any concerns.)
Alabama: Alabama Secretary of State's Election Division
Alaska: State of Alaska - Division of Elections
Arizona: Arizona Secretary of State - Elections
Arkansas: Arkansas State Board of Election Commissioners Arkansas: Arkansas Secretary of State - Elections Site
California: California Secretary of State - Elections and Voter Information
Colorado: Colorado Secretary of State - Elections Center
Connecticut: Connecticut State Elections Enforcement Commission Connecticut: Connecticut Secretary of State - vote-ez-ct site
Delaware: Delaware Department of Elections - Polling Place Locator Delaware: Delaware Commissioner of Elections site
D.C.: District of Columbia Board of Elections and Ethics
Florida: Florida Secretary of State - Division of Elections
Georgia: Georgia Secretary of State - Elections Division
Hawaii: Hawaii Office of Elections
Idaho: Idaho Secretary of State - Elections, Campaign Disclosure and Lobbyists Idaho: IdahoVotes.gov site
Illinois: Illinois State Board of Elections
Indiana: Indiana Secretary of State - Elections Division
Iowa: Iowa Secretary of State - Voter/Elections
Kansas: Kansas Secretary of State - Elections & Legislative
Kentucky: Kentucky Secretary of State - Elections
Louisiana: Louisiana Secretary of State - Elections Division
Maine: Maine Secretary of State - Bureau of Corporations, Elections & Commissions - Elections Division
Maryland: Maryland State Board of Elections
Massachusetts: Massachusetts Secretary of the Commonwealth - Elections Division
Michigan: Michigan Secretary of State - Voter Information Center
Minnesota: Minnesota Board of Campaign Finance and Public Disclosure Minnesota: Minnesota Secretary of State - Election Center
Mississippi: Mississippi Secretary of State - Elections Division
Missouri: Missouri Secretary of State - Candidates and Voters
Montana: Montana Secretary of State Polling Place Locator Montana: Montana Secretary of State - Voting Information
Nebraska: Nebraska Secretary of State - Elections
Nevada: Nevada Secretary of State - Election Center
New Hampshire: New Hampshire Secretary of State - Election Division
New Jersey: New Jersey Department of State - Division of Elections
New Mexico: New Mexico Secretary of State - Elections
New York: New York State Board of Elections
North Carolina: North Carolina State Board of Elections
North Dakota: North Dakota Secretary of State - Elections and Voting
Ohio: Ohio Secretary of State - Elections & Ballot Issues
Oklahoma: Oklahoma State Election Board
Oregon: Oregon Secretary of State - Elections Division
Pennsylvania: Pennsylvania Department of State - Bureau of Commissions, Elections & Legislation
Rhode Island: Rhode Island Secretary of State - Elections & Civics Division
South Carolina: South Carolina State Election Commission - SCVotes.org site South Carolina: South Carolina State Ethics Commission - Campaign Financing Reporting
South Dakota: South Dakota Secretary of State - Elections & Voter Registration site
Tennessee: Tennessee Department of State - Division of Elections Tennessee: Tennessee Registry of Election Finance
Texas: Texas Secretary of State - Elections Division
Utah: State of Utah Elections Office Utah: State of Utah Candidate Reporting System (Campaign Finance)
Vermont: Vermont Secretary of State - Elections & Campaign Finance Division
Virginia: Virginia State Board of Elections
Washington: Washington Secretary of State - Elections & Voting
West Virginia: West Virginia Secretary of State - Elections
Wisconsin: Wisconsin Government Accountability Board - Elections Division
Wyoming: Wyoming Secretary of State - Elections
(Final Note: Some states have two links; I compiled this list a while ago and just recently updated it. It contains all main election sites for the 50 states and D.C. and also contains some ancillary sites for some states. The inclusion of these ancillary sites does not imply anything; they are just sites I happened to come across while building this list.)