Found two cool ways of linking your website to others in “meatspace”:

• GeoURL will instuct you on how to add meta tags to your web page to place it geographically. If you click on this button: [geourl.org is offline —Ed. 2015-08-22], you can see websites that have registered near me.
• D.C. Metro Blog Map is “the incredibly spiffy map where you can find bloggers in the D.C. metro area, arranged by metro station.” I’m near Shady Grove, myself.