I posted on this subject in GD last night, but thought I'd post this link here, too:
http://www-personal.umich.edu/~mejn/election/2006/ Our new, bluer USA!
Also, take a look at Wisconsin for a minute. See that red section in the Southeast? The little blue spot in the middle of it is Milwaukee, and surrounding that are Republican strongholds which include Sensenbrenner's 5th District. Yes, he's still there! :( And that's where I live. It's true that Wisconsin in blue, but looking at this map, you can see what those of us in red areas are up against, and why I complain!
By the way, at the link, there is a "city lights" map so that you can compare population centers with the blue areas, and also a map that is morphed to reflect the true numbers of red v.s. blue voters. ;)