If you're an Apple developer but weren't able to attend WWDC 2013 in San Francisco, that doesn't mean you have to miss out on all the sessions taking place.
Apple has begun posting the over 100 session videos to their developer portal for your viewing pleasure. In addition to the sessions being posted online, if you've downloaded the WWDC 2013 app, you'll find the videos posted there as well with full support for AirPlay.
As of right now, there is approximately 30-40 seessions available for viewing and more will be added daily as WWDC 2013 wraps up. Keep in mind, you do need a registered developer account in order to access the content.