If you are visiting London for the first time, podcasts can be really helpful. They range from short 3 minute clips of places to visit, to more detailed and descriptive pieces you take with you and listen to as you visit different areas of the city. When traveling, you can also upload them to your iPod or mp3 player and take it with you. Podcasts can also be in audio form only or video.
Podcasts are great to have because they can give you a persepective of London from people that have traveled there before or even those who live in the city. Having varying points of view, whether from the traveler or the eyes of a local, enhances what you are seeing, or planning to see, because you get the little facts and tips that not everyone is privy to.
Although I didn't use a podcast when I traveled to London over spring break (luckily I had my own form of personal tour guide in my father who's been there enough times to know the ins and outs of the city) my parents used one when they went to Paris and loved it. They were able to learn about the historic parts of th city that they would not have gotten by just walking by.
I went searching for a couple podcasts to share and found 2 short clips that give an overview of different things to do and see in London. A couple I've mentioned before, but other places are new. Check them out if you'd like. These are in video podcast form but podcasts about London can be found in audio form, too.
One is from Visit London Podcasts. These guides are organized by different sections of London.
The second one is from Visit Britain Podcast. Check it out on YouTube here.
So, get out there, see the sights, and, if you want, create your own podcast about what you saw and the things you learned about London.