MagicGeek is doing a video series called How to be a Street Magician (really a busker). I've watched the first two episodes and both have been really good. They have some great advise here for anyone looking to get into busking.
Episode 1
http://www.youtube.com/watch?v=2jRO-nJHmdE&NR=1
Episode 2
http://www.youtube.com/watch?v=zd7zwIlsyTk
Episode 1
http://www.youtube.com/watch?v=2jRO-nJHmdE&NR=1
Episode 2
http://www.youtube.com/watch?v=zd7zwIlsyTk