Check out Loki, a location-based local search application that is available for both Mac and PC users. Named for the Norse god of trickery, the application lets your computer fold your location (via GPS) into your Internet experience. MyLoki lets you share your location with friends, automatically. LokiMobile lets you take the application with you on your mobile device. If you routinely want to find close-by restaurants, post offices, or other information dependent on your location, this might be a really useful tool for you.
The existence of tools like this tells me what many of us already know: the world is going increasingly mobile, and our online services have to be available in that format to remain relevant.