This year's conference sold out in a little over four weeks, nearly twice as fast as last year's event, which was the first time in the show's history that Apple was forced to halt the registration process.
WWDC has grown dramatically in recent years, prompting Apple to move the event from the original underground Moscone Center into the modern new Moscone West building. In 2007, Apple set a record for WWDC attendance with 5,000 developers from around the world. This year's conference will see even more attendees.
On its developer web site, under the notice that WWDC 2009 has sold out, Apple says, "Session videos will be available to purchase shortly after the conference. More details will be available soon."
The Cupertino-based company is expected to use its opening keynote at this year's conference to show off a feature complete version of Mac OS X 10.6 Snow Leopard. It's also a likely stage for the electronics maker to take the wraps off its third-generation iPhone hardware, a move which would mirror that of years past.
WWDC 2009 runs June 8th through the 12th. For a recap of last year's announcements, see AppleInsider's WWDC topics page.