David.
If you're curious about other ATP members, you can search by State & Town or Zipcode, or browse a map. Anyone who HAS listed their location will show up on the Member Map. The location-mapping software is really good, it can handle things like "Central Texas". That can be handy if you want to swap plants or bulky items with other members, but don't want to pack them for mailing cross-country. (You could find someone who lives nearby, then C-mail them privately to arrange a swap or get-together.
If you don't list a location in your profile, other members won't be able to find you on the map.
MAP:
http://garden.org/users/member...
(Click on the left-hand blue menu button: "Goodies" then click:
"ATP Member Map - View all the ATP members on a map of the world.")
Member Search feature:
http://garden.org/users/member...
(Bottom of every ATP page, "Memberlist")