Google Latitude works great on the
(unreleased) Sprint Treo Pro.
Reason? The "
My Location" feature works on the STP,
aka cell tower triangulation/A-FLT.
Granted, this method is much less accurate than GPS/aGPS but the benefit is this: uses virtually no battery life so you can leave it on 24/7 and it will 'track' you even if you exit the program (seriously, it even asks), second it's instant/very fast and third it works completely indoors, deep inside any building.
I'm also more comfortable knowing people can see me in the vicnity but not within a 100 feet, lol. OTOH, if I do want that I just switch on GPS and bang...instant, accurate location for everyone.