There’s all sorts of good stuff coming down the pike, including location-based services that work with GPS phones, and going to a new city and then reading reviews of restaurants right from your phone, just to name a few.
The one catch? Roaming charges. MocoNews argues that they’re a pretty hefty barrier, too, since you’ll be using the services in countries other than the one you live in: “no-one’s going to use a data-rich mobile service while roaming, not after the first bill, anyway.”
Hopefully Lonely Planet will figure that piece of the puzzle out before they launch.