Other than using things like Google latitude to mark locations and routes for hiking and photography and the like; I didn't use any of the other services.
I would say that it would start being integrated into other services where it makes sense. For example, proximity services to share coupons or offers or reviews with your would-be customers...
I've been working on a project (and realizing how dreadful my self-taught coding skills currently are) that uses that innate tendency we have to associate our identities or personalities with the places we frequent, and our desire to communicate with others.
As a side note, if anyone is looking for an interesting mobile/web app project to get involved with, I'm now looking for someone better than me with Javascript ;)