Apple offers IT video collection through iTunes

I saw on Ars Technica [url]http://arstechnica.com/journals/apple.ars/2008/01/10/apple-offers-it-video-collection-through-itunes[/url] that a large number of videos have been posted for purchase. For $500 it is not chump change but I do like to see Apple starting to realize more info is needed then their manuals. My question if anyone has found out if these are just the WWDC videos from their seminars that where already available in the ADC on iTunes section or was that area limited to WWDC attendees only? (it looks like only the WWDC videos i have already downloaded...) Sam