Apple has announced that the annual Worldwide Developers Conference [1] (WWDC) will be held 11-Jun-07 through 15-Jun-07 in San Francisco, two months earlier than in 2006. Developers can now start planning travel around those dates, and it's even more certain now that Leopard will ship before June, since Apple will want to focus on new and upcoming technologies at the conference. That said, I'll be surprised if Apple announces the next big cat at WWDC to avoid taking any wind out of Leopard's sails. Although there were only about 14 months between Jaguar and Panther, it took 18 months for Tiger to ship, and Leopard appears to be on track for 24 months. (Special thanks to the excellent Mactimeline.com [2] site for date confirmation.)

[1]: http://developer.apple.com/wwdc/
[2]: http://www.mactimeline.com/