I suppose I'm drifting a bit afield from economics, even if the question of information is highly relevant to the topic, but I thought these things might be of enough interest to post. (Kevin may edit this to improve the signal:noise ratio I'm clearly harming. But since Google has long been of interest around these parts...)
Google-Traffic: Combining Google Maps with traffic data from Traffic.com, you can now take a look at the major road conditions and trouble points on your commute home. (If you live in the listed cities, anyway.)
Google Housing: Maps and Craig's List come together to show you the location of the next place you might call home.
NYC and Chi-Town Hacks: See where the stops on the subway or the El are situated on Google Maps.
UPDATE: Here's another one for the Chicago audience. Chicagocrime.org offers an interactive Google Map paired with crime data.
I love the Google Housing idea; it could be a really solid competitor to the MLS, if the FSBO folks would join in....
The google traffic data is actually not from traffic.com, its from yahoo traffic.
Just figured i'd make a note.
Cheers,
_Michael.