Google Latitude -- the service that either allows you to keep track of your friends or be stalked by stalking stalker types, depending on your point of view -- is finally available for the iPhone and iPod touch. No, it's not built into Google Maps as part of iPhone 3.1 with push update capability. No, it's not built into Google Mobile app. No, it's not even set up as an iPhone app in and of itself.
Google Latitude is a WebApp and it runs in Mobile Safari using the iPhone 3.0 geoLocation feature.