German rock-climbing website, via-ferrata.de, has created a Google Map mashup of climbs in the Alps. The climbs are submitted by users of the site and gpx files can be downloaded for each climb.
All the climbing routes are shown on one Google Map. However, if you click on any of the individual map markers, there is a link to a more detailed map of the individual climb. Each climb comes with its own Google Map, an altitude graph and links to download a gps track.