Geotagged Podlove

we would like to create a wordpress podcasting site where podcasts are geotagged. That is, each podcast has a tag on a map (Google or better OpenStreetMap). The goal of the site is to provide a guide of cities where certain places have a podcast describing them. I mean a feature like this Castopod supports the Location tag

Do you have suggestions (and possible plugins) for implementing the idea?