The effort I put together reads the trip calendar, displays the entries in a list, and for any entry that has a 'Where' value, it tries to plot it. Given the amount of similar (but not quite the same) examples of GME code provided, it was quite straightforward. I've added a button to see where we are based on today's date, and I'll add another one later on to show where we will be on any given date.
At the moment the map's speech bubbles just show some placemarkers, but eventually they will be links to blog entries and images that are tagged with that location. It should make a good overall dashboard for anyone interested in following our movements. Here's where you can go to take a look (I've removed the itinerary map from the bottom of this blog and changed the Itinerary link on the right to point to the mashup).
PS: My wife Letizia is going to start blogging very soon (in Italian and English). I'll pass along the URL when it's up and running.