I found some really helpful websites relating directly to my What is a Line brief. They are called 'Overheard in London' and 'Overheard in New York'. People write or email in conversations that they find interesting or funny and they get rated by people who view the website. I am going to scour these sites and find my favourites to use.

http://www.overheardinlondon.co.uk/ 
 http://www.overheardinnewyork.com/


I also found an archive dedicated to gossip overheard on the London underground.

http://www.themanwhofellasleep.com/gossip.html