Apple's annual Worldwide Developers Conference is a great opportunity for iOS developers to meet one another and to pick the brains of the experts at Apple, but not everybody gets the chance to make it out to San Francisco.

So, in order to bring in-depth, face-to-face technical information to even more developers, Apple has announced the iOS 5 Tech Talk World Tour.

Full-day events taking place in nine cities around the world, the tech talks feature Apple employees discussing high-end coding and design techniques for iOS developers.

Topics include iCloud, user interface design, UIKit, Game Center, Newsstand, OpenGL ES, AirPlay, and much more--topped off with an hour of wine and cheese. The talks are totally free for all members of Apple's iOS developer program, though as tickets are issued on a first-come, first-served basis they tend to fill up quite quickly.

Apple has held similar events in the past, in 2009 and 2008. This time around, the world tour hits Berlin, London, Rome, Beijing, Seoul, São Paolo, New York City, Seattle, and Austin.At the time of writing though, all but three events - Berlin, Rome and São Paolo - had sold out.