Google Maps "trip tracker" plugin?

Hey, everybody.

So, here’s what I’m looking to do. I’ve got a client who’s going on a trip around Europe and Asia and will be live-blogging his trip over about a month or so. They’d like to be able to attach a Google map to his posts showing where he’s posting from (which is fairly easy based on the few plugins that I’ve tried). Here’s the kicker, though: They’d also like to be able to have a “master map,” that would show all the locations that he’s “checked in to.”

So, my question is: Does anybody have any plugin recommendations that would do this? I’ve found plenty that have been able to assign maps to individual blog posts, but I can’t seem to find one that will keep track of all those points with the ability to put them onto a master map.

Any suggestions?