GeoPress
Installed GeoPress a plugin for WordPress for easy geocoding of blog posts including the display of maps. GeoPress is free/open source software and uses Google Maps as its data source. In its current version (v2.2) GeoPress only supports a single location to be associated to a blog post—but in the future multiple locations, lines, polygons, and further customization of the map should be possible.
To show an example of the capabilities of GeoPress here is a map of Barcelona, a place I was pleased to visit recently.
Via O’Reilly Radar.
Software: WordPress 2.9
with Hiperminimalist Theme modified by makemaps.net.