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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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 latest polling on the races in the House of Representatives give the democrats a significant advantage over the republicans. CQ Politics has some maps and data.

10/3 Update: Map of repackaged Economic Stabilization Act of 2008 from The New York Times
Details on the Republican and Democratic representatives who voted to reject a $700 billion rescue of the financial industry.
From The Electoral Map
The New York Times has a great map of the “NO” votes on the bailout bill yesterday.  There’s not really a clear [...]

MapMash has a collection of political maps using google maps showing current members of congress and the state of the presidential race.

Mashup of US Electoral Map and Google Maps will allow you to interact with google maps to calculate 2008 US Electoral votes.This mashup will allow you load the map with previous election results and current polls.