It lets you provide visitors a link with which they can directly open or download a KML-format file of all your published venues, complete with venue descriptions, links (if the venue contains one), and automatic creation of markers with latitude and longitude. That is generated from the basic address information for the venue - you do not need to enter latitude or longitude anywhere. There is just one file to upload, but make sure to read the requirements in the readme.txt file that comes with the zip file.
See it in action here
