Lots of talk about the 3G iPhone this week. We’ll see lots of local applications developed that make use of faster speeds and GPS capability, as speculated. The $199 price tag will also make it more mainstream friendly than before.

One example of a local application we’re hearing about is the Yellowpages.com local search app. This will be the second iPhone app from the IYP, and will add local social networking features. Social networking around local businesses (particularly bars and restaurants) is another possible killer app on the mobile device that could be realized through the 3G iPhone and other rising hardware and software standards we’re seeing.

Other mobile, local and social mashups we’ll see emerge on the iPhone include one from Yelp and another from Loopt that was demoed on stage with the 3G iPhone’s launch at the WWD conference on Monday. Expect others.