As a forward, let me talk about the Palm Pre for a few minutes. Alternatively, you can just read that article I just linked to then skip a couple paragraphs.
So, when will Mobile Browsers be the new Mobile API?
Why can't I, Arron Washington, Destroyer of Worlds and Small Celestial Bodies, visit http://maps.example.com, be prompted by the phone ("Hey Mr. World Smasher, this website would like to access your phone's GPS!"), and then have all the tight integration you would come to expect with an application on any website the Web cares to offer?
Now, some privacy nuts will tell you, "Hey man, what happens if I enable a site to use my GPS to find my location? That's an invasion of my privacy!" I'll tell those folks, don't get in a boat with cannibals.
I think with the Palm Pre we're inching just a little bit closer to that. The whole awesome website-phone integration thing, not the boat full of cannibals thing.