I use Google Reader to follow the Google alerts I've set up for various topics and a few of those topics are things like "Lewisville + North Carolina", "Foryth County + North Carolina", "Winston-Salem + North Carolina", etc. Over the weekend I noticed a lot of headlines like West Salem Historic District Marker showing up and decided I needed to take a look. That's when I found what promises to be a huge timesuck, the Historical Markers Database, an online database of historical markers from around the country that provides a separate page for each marker that contains the GPS location, inscription, a list of other nearby markers and a map. Way cool.