You are in Los Angeles at a convention. You need a ride to LAX. You figure you could just call a taxi but is that really the best option?
Enter labs.Google.com/ridefinder, the quickest way to see which company has the closest vehicle to you.
http://labs.google.com/ridefinder?z=...%2C%20CA&src=1
Just zoom in on your location (Universal City Walk) and get up to date information from the cabs GPS unit. Never let Yellow Cab fuck you over by promising 5 minutes when they know it will take 30. You can see that SuperShuttle has a van dropping off at a local hotel and call them instead.