WP Silverlight GPX shows your trak in the map with altitude graph from a gpx file.
You can also move the mouse over the altitude graph and check the position in the map.
Install the plugin as usual and set your Bing Maps Apy Key in the settings.
Upload your gpx file and then add the shortcode in the articles
See in action:
In order to save bandwidth and speed up the map loading time, the original GPX file is reduced server side and then sent to the application.
You need a Bing Maps Api Key, you can generate here: http://www.bing.com/toolbox/bingdeveloper/
If you find a bug or if you have a request, feel free to contact me..