If you like TED Talks then I think you might like these RSA Vision videos. They are also available via an RSA iPhone app.
There are not as many presentations as TED and most last longer than 20 minutes but its an excellent selection of talks that were videod at the RSA in London.
The most recent talk I watched was from Kathryn Schulz on Being Wrong where she presents a tribute to human creativity and the way we generate and revise our beliefs about ourselves and the world.
I am a fellow (just a fancy word for member) of the RSA and use the RSA in London as my "London office". It has a good though small library; wi-fi and a great little bar for meetings. There are also meeting rooms and seminar trooms you can hire; a members magazine and evening talks. All in all, excellent value.