The word from theiphoneblog is that Apple has now let iPhone and iPod Touch developers know that WWDC 2009 Sessions are now available to buy through developer.apple.com.
With the WWDC 2009 Sessions, developers can watch Apple engineers deliver in-depth tech info on the tech which powers the iPhone operating system and Mac OS X.
Besides session videos there is also access to presentation slides and sample code to make the most out of each session. Session costs are $299 for each iPhone or Mac session or you can purchase both for $499.