Mashable just launched a new website function that highlights Local Twitter Trends on a Bing Map. The application is intended to give devoted Mashable readers a sense of trending topics in selected areas around the world. Wondering what people are tweeting about in New York? Click the pin in New York and the popup balloon will show the top New Yorker Tweeting trends. And hey, this was so interesting that Chris Pendleton sat down to talk about it with Mashable CEO, Pete Cashmore.