One of my favourite plugins was currently updated, the Google Maps Worpress PluginIt allows you to easily embed .gpx and .kml files into your blog :)What you basically do is:

  1. copy the plugin to your plugins folder
  2. open the show.php file and put your google maps api key where it says "$googlemaps_key = "
  3. open wp-includes/functions.php and insert the following two lines to the filetypes section:‘gpx' => ‘application/gpx'‘kml' => ‘application/'
  4. activate the pluginto use it just upload a gpx or kml file and link to it ( e.g. < a href="; http://blablabla/yourfile . gpx " / >) the plugin will automatically insert an Iframe of your maps data.
UPDATE: There's a new version of the plugin