Apple announce the date for its annual Worldwide Developers Conference. The WWDC 2007 is to be happen in San Francisco June 11-15, 2007. Apple typically uses the conference to bring developers together with its engineers, allowing them face time to learn about new technologies. While the conference is closed to the public, Apple CEO Steve Jobs has used past developer conferences to show off the latest advances in the company’s operating system. With Mac OS X Leopard expected in the first half of 2007, it is possible we will see the official launch of Leopard at WWDC.