http://charthorizon.com/races/2006_galv ... k_back.php
This shows from the finish time => forward. The full-blown interactive map for track backs will not be availble (at this point) since folks are going to be ambling back at their own speeds. It would be difficult to display.
This page essentially updates every hour, and once you get your boat selected and the layers like you like them, you can bookmark it, and off you go.
Select the Four Agreements boat for a good example since they've actually moved. The transponders are all still reporting at 2h intervals, but this map only shows the latest position and every 6th hour.
I hope to have data download avaialble, too.