As expected, Democratic candidates would take several House of Representative spots previously held by Republicans. Currently, 20 seats have been gained and there are 7 races that are still too close to call.
New York Times

Washington Post

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Democrats picked up at least five Senate seats, but missed their goal of acquiring a filibuster proof majority (60).
Highlights for the Senate races (work in progress):

3 races remain too close to call: Alaska, Georgia, and Minnessota
In Minnesota, incumbent Republican Senator Norm Coleman held off challenger Al Franken, however less than 800 votes separate the [...]

 Indiana can give clues as to how the election will unfold, in particular Vigo and Hamilton county. View the 2004 county map below and then visit the current map. (via New York Times

New York Times 2008 Election Results (president, house and governor)
Vigo Co. bellweather of U.S. voting

2004 Election Map in Indiana

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The polls start closing at 6pm eastern time in Indiana and Kentucky and by 7pm polls will be closed in Virginia, Florida, Georgia, South Carolina, and Vermont. Ohio and West Virginia close at 7:30 and at 8pm polls close across the country from Texas to Maine. More than half the country will have [...]

In addition to the presidential election, there are 435 congressional races, 35 senate races, and 11 gubernatorial contests to keep an eye on. Here is a round up of some of the best guides to watching the 2008 elections. (will be updated through out the day, so be sure to check back)  
What to [...]

The Washington Post has another map out in their Political Geography series, this time examining the key swing states in the 2008 presidential election.
A state-by-state breakdown of how Barack Obama and John McCain are expected to perform on Tuesday.
click for interactive full-size map

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Our Vote Live.org is tracking voting problems being reported during the November 4th, 2008 election and has several maps showing where the problems are occurring, both at the state and county level. .  
The maps below are from 11:30 AM EST, but already show that there are a lot of voting issues accross the country. [...]

Today’s op-ed in the New York Times looks at how the electoral college used to determine the president of the United States disproportionately favors smaller states. For example, 1 electoral vote in Wyoming represents 134,783 voters, while 1 electoral vote in Pennsylvania represents 456,216 votes.
This map shows each state re-sized in proportion to the [...]

With one day before the 2008 Presidential election, Barack Obama appears headed for an electoral map changing victory over John McCain. McCain now finds himself defending traditional red states and hoping for a way to pull off an upset.

Working with the Digital Scholarship Lab at University of Richmond, the Google Earth team mapped presidential election results from 1980 to 2004 by state and county for Google Earth.

Download this KML to Google Earth. (recommended way to view data if you have google earth on your computer)

from Google These maps show how the population has [...]

Visit maps.google.com/vote and enter your address to find information on where you vote on election day, Tuesday November 4th 2008.

Important: You must be registered in order to vote. Voting locations shown are for the November 4 election only (not for early voting), and it is only for voters registered at the home address entered. Please [...]

Men’s Health magazine ranks the political habits of America’s cities by registration, donations, spending, and participation in recent elections.
Most Political City: Raleigh NC
Least Political City: Modesto California
Highest Percent of Income Donated: Corpus Christi Texas
Highest Percentage of Active Registered Voters: Anchorage Alaska
Highest Percentage of Ballots Counted: Cheyenne Wyoming

Voter registration deadlines have past in many key states, including Virginia, Pennsylvania, Florida and Ohio. This map from the Pew Center On the States shows each states deadline.

The Pew Center on the States has another great map on the 2008 election, this one focusing on early and absentee voting across the country. All states now have some form of early voting via no-excuse absentee voting and many more have in-person early voting.

Early and Absentee Voting Map

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With less than a week remaining, Barack Obama appears headed for an electoral map changing victory over John McCain. McCain now finds himself defending traditional red states and hoping for a way to change the momentum of the race in the final days.

FiveThirtyEight.com : Obama 351, McCain 187
Electoral-Vote.com : Obama 375, McCain 157, Toss [...]

Polling continues to predict Democratic gains in the senate with a filibuster-proof majority of 60 possible.
Latest Senate Polls:

New York Times:  53 Democrats, 41 Republicans, 2 Independents, 4 seats are a toss up
Pollster: 55 Democrats, 38 Republicans, 2 Independents, 5 seats are a toss up
FiveThirtyEight.com:  57 Democrats, 41 Republicans, 2 Independents
CQ Politics: 54 Democrats, 40 [...]

VerifiedVoting.org compiled information on what types of election equipment is used across the nation. Paper ballots, punch cards, mechanical levers, and electronic ballots (both with and without a paper trail) are among the many ways that America’s voters cast their votes.

Info Chimps created a map showing the Geography of Newspaper Endorsements in the 2008 US Presidential Election, including newspaper circulation, current polling predictions and 2004 endorsement history.

As the campaign for president enters the final three weeks, Barack Obama seems to have an insurmountable lead over John McCain. The electoral map looks so favorable to Obama that Indiana, North Carolina and even North Dakota have listed as toss ups.
There are still a few factors that can change the course of the [...]

The democrats appear poised to pick up at least 5 Senate seats currently held by the republicans without losing any. There are also 2 tossups currently held by republicans, Wicker in Mississippi and Dole in North Carolina.
Pollster, New York Times, FiveThirtyEight.com, CQ Politics and Electoral Vote all have recent analysis of polls and predictions.

FiveThirtyEight.com [...]

Pennsylvania

Our Vote Live.org is tracking voting problems being reported during the November 4th, 2008 election and has several maps showing where the problems are occurring, both at the state and county level. .  
The maps below are from 11:30 AM EST, but already show that there are a lot of voting issues accross the country. [...]