If you're planning to visit London for the 2012 Olympics, then don't forget to download these essential travel apps before your trip. Whether you need convenient transportation or cool activity ideas, we've got you covered. From a detailed city guide to a streamlined weather forecast, here are eight must-have apps for a fun, hassle-free London stay.
Recession-Busting Britain: Best Free Experiences (Free)
Available on Kindle, Nook, Google Books, and on the iBookstore, the Recession-Busting Britain: Best Free Experiences  ebook provides the best free activities throughout England, Scotland, and Wales.
London Travel Guide — Lonely Planet ($6)
With over 1,500 author-recommended landmarks, shops, restaurants, pubs, hotels, and activities, the London Travel Guide — Lonely Planet  app is a no-brainer for anyone who plans to visit the city. Bonus points for maps that work without a WiFi connection.
London Tube ($1)
The London Tube  app offers a full guide to city travel: official subway maps, Google Maps compatibility, and a journey planner tool that lets you navigate the best route to your destination.
London — The City (Free)
Download the Lonely Planet Travel Guides  app — usually $3, but free until July 30 — then choose the Audio Walking Tours tab. The London walking tour provides a "guided" stroll throughout the city, complete with audio commentary that features excerpts from the BBC archives.
Prefer to take a taxi? The Hailo  app lets you get a taxi in two taps, and you can pay with either cash or credit card. By opening the app, you can see an estimated arrival time for the nearest taxi.
Weather Time London ($1)
The Weather Time London  app is a fun, convenient alternative to your standard weather app. Featuring cool graphics and animation, it provides today's weather and temperature plus two more days of forecast conditions.
The Guardian (Free)
Catch up on all the local London news with The Guardian  app. You can even customize your home screen with the news topics, videos, and galleries you care about most.
London Official City Guide (Free)
With the London Official City Guide  app, you can browse London landmarks, museums, shops, restaurants, hotels, and attractions. Even better? You can save your favorite events to the app or add them to your iPhone calendar.