If you're an avid Foursquare user you can already display your last checkin, visualised on a map, in the sidebar of your WordPress powered site with the WP Quadratum plugin. Foursquare, checkins and maps ... what more could you ask for? Maybe the answer is more maps.
Version 1.1 of the WP Quadratum plugin, which went live this morning, now has added maps. The previous versions of the plugin used Nokia's maps, because I work for Nokia's Location & Commerce group and I wanted to use the maps that I work on. But if Nokia's maps aren't the maps for you then how about Google's, or maybe CloudMade's OpenStreetMap maps or perhaps OpenLayers' OpenStreetMap maps.
As usual, the plugin is free to download and use, either from the official WordPress plugin repository or from GitHub.
As a fully paid up and self confessed map geek I may be somewhat biased but surely most things can be improved with the simple addition of more maps.