The App Store is available if you have updated to iTunes 7.7. I took a quick look at some of the first round of apps (there are 500 at launch) and found the expected Whrrl, Loopt, and Yelp apps, but there are others as well. If you need a map for a subway in the US, you are in luck since there are tons of subway maps. It looks like a couple of the Twitter clients are location enabled, I am pretty excited about that. The upshot is that it looks like we are doing pretty good with the first round of the App Store location apps. There is still a lot of room for growth for a GPS capture and more personalized (GISy) mapping app.