Filed under: iPhoneWe've been touring the mean streets of San Francisco this week, and when we ended up at a party a little too far away from the hotel the other night, TUAW's own Victor Agreda pulled out Taxi Magic, an app he'd recently downloaded on his iPhone. It's a free application on the App Store, and it uses your location to automatically show you a list of taxi services at your disposal. If you're too far away for one of Taxi Magic's partner services, the app works like a yellow pages -- you can browse the various companies and call one for a taxi whenever you want. But if you're in one of the 25 US cities that offer booking within the app, you can do what Victor did: hit a butt