[support] Re:Geotagging and GIS in Drupal?

I wrote:

another thing I'd need from Drupal is Geotagging support, that is the ability to categorize and search content based on location:

More broadly, I'd like to know how to do with Drupal (and visit working examples) everything mentioned here: http://interactive.linuxjournal.com/node/8025/ TIA, Ortles