I've had the CityID application on my Treo's for a long time and has always been one of my favorites. I live and work in and around Chicago and all of the suburbs, and having the exact CITY/state (not just state) information display on calls is extremely helpful!

Cequint Inc used to make this application, and I know there is an application currently offered for State-only information. Hopefully someone can revive this service (to show City names for calls) for WebOS, because it is sorely missed!!

BTW... this is actually one of the few apps I would actually pay to have!