Thanks for offering this troubleshooting question. love my Doird and I haven't needed much help (reading many of the forums has helped) but this problem has me stumped.
I bought my Motorola Droid in December when they were having the BOGO sale and I got the Eris for my wife. Both phones are registered in my name. Oringinally, there was just my verizon email address listed, though I immediately added a gmail address for myself so that we could use the contact list from Google Voice to load both phones (if I add a contact it will go to the Eris and visa-versa).
When I joined Latitude, my Moto-droid would show my location. But the Eris would always show ME as being at the location of the Eris instead of where I really was with my Moto.
So I got my wife a gmail account and sent her an email to be my Latitude friend. She accepted. I tried to make HER gmail address the default address for the Eris, but the Eris still shows me as being with it instead of wherever I really am (with the Moto), and whenever I try to look her up on my Moto, it lists her name, but underneath it just says "location unknown." and just shows my current location on the map.
How do I get the Eris to show my location (with the Moto-Droid) and my Droid to show HER location with the Eris?