Podcasts and Google Analytics?

Me and a friend have a chat show podcast published on iTunes, and I’m wondering if anyone has suggestions as to how best to track downloads (which are published as M4A (AAC) files.

I’m a big fan of Google Analytics, so does anyone have any suggestions as to how I could employ this in monitoring, if it’s even possible? I couldn’t find anything on discussion boards and by searching.

I’m particularly wanting to be able to group my listeners by location.

Thanks :)