Locatable and iPhone 3.0 issues

Several people have reported that Locatable -- I think Relocatable, actually -- is not working on iPhone OS 3.0. I haven't had a chance to debug yet but consider this an open thread to complain and/or troubleshoot.

Note that Apple has now built the Geolocation API into the Mobile Safari browser in 3.0 using the standard navigator.geolocation object. Looks like Locatable was just ahead of its time!