I can’t do this, but it looks like the future to me.

A nice feature of Google maps:

Take a GPS log file
Convert it into the .KML format used by Google Earth.
(You can make these with GPSbabel, amongst other utilities.)
Put it on a web server somewhere
Go to Google Maps, and search for the URL of the .KML file
You’ll get a nice map of your track. And you’ll even get information about how to link to it and how to embed it in your site. Here’s a section of the route I walked today, for example:

Here’s the result.

…and here’s the man who knows how.

Fantastic.