Breadcrumbs is a great application that allows you to view your GPS tracks using Google Maps and the Google Earth browser plug-in.
Using Breadcrumbs you can create map based visualisations of your GPS tracks and include geotagged photographs and videos. The application includes automatic geotagging of your photos and videos and an easy to use editing tool that enables you to correct GPS points. It is also possible to add information and markers to illustrate interesting points on your tracks.
Completed tracks can be shared via a Breadcrumbs public page for each track and through direct integration with Facebook.