It’s incredible how Apple manages to put a “sold out” sign on two things in the same week: first the iPhone, now WWCD! Their World Wide Developer Conference is indeed something journalists, consumers and developers look forward to every year, but this year, it’s a whole different story. The conference is to be held June 9-13 in San Francisco, and has been sold out for the first time in its history.

Apple spokeman Bill Evans confirmed the story to Macworld: “Response to this year’s WWCD has been off the charts and we are delighted with the show of enthusiasm and support from the developer community for the new iPhone SDK. The conference is now sold out. For those unable to attend WWCD, session videos will be available to purchase on iTunes shortly after the conference.”

It still remains unclear how many attendees this year’s conference will have, as Apple wouldn’t elaborate on the subject, but it will most certainly be thousands, based on previous years, all eager to see what Apple CEO Steve Jobs has to say in his keynote, scheduled for Monday, June 9 at Moscone West.

What to expect this year: over 150 sessions and labs, with Apple engineers going into details on the technologies that power the iPhone OS, Leopard and Leopard Server. The conference will include the first-ever iPhone track sessions for developers and the iPhone Lab, with insight into development techniques, including interface, web capabilities and iPhone SDK.

In addition to all that, Mac engineers will offer developers a helping hand into creating innovative Mac OS X applications, by shedding light on the tools and techniques used by Apple, including a better understanding of how Leopard’s 2D and 3D graphics technologies could help developers create vivid and engaging visuals for their applications.

More details about Apple’s World Wide Developer Conference can be found here.