Here is a list of sites that have sparked my interest of late:
Reference Book of the Day (self-explanatory)
What's That Bug-people send in photos and descriptions of a bug that they've found in their shoe, bathroom or on their foot. The Bugman will identify the pest for poster.
NationalGeographic is always tops in my book and their interactive site on the Salem Withcraft Hysteria is very well done.
The Free Government Information is a place for initiating dialogue and building consensus among the various players (libraries, government agencies, non-profit organizations, researchers, journalists, etc.) who have a stake in the preservation of and perpetual free access to government information. FGI promotes free government information through collaboration, education, advocacy and research.
The Car Sharing Network provides information for persons, generally city dwellers who only need a car occasionally. The site has a chart of cities that have car sharing providers,and links to their pages.
I use quite a few search engines. Google of course for its ridiculously huge index, and I also like Teoma and Sciris for scientific information.
Some new search engines that are worth a look are Infomine, Icerocket and Exalead. (at least to me they are new) Infomine searches scholarly internet resource collections. If you want to view thumbnails of pages before visiting them use Icerocket and Exalead.