Heh,
A true test is finding the keynotes made consistently since 2004 with no outside help from sites like this

. Though I did cheat with the last WWDC and just linked to Macrumors, though found the link by myself (without spoilers) on the quicktime site before it was posted here. With that said, I am again cheating this year by watching macrumors because i have lots going on at work today and can't keep by my firefox browser with reload every refreshing my page in 15 second intervals.
BTW I wouldn't be surprised if they use one of the following URLs (they have done similar in the past).
http://www.apple.com/quicktime/qtv/letsrock0908/
http://www.apple.com/quicktime/qtv/letsrock08/
http://www.apple.com/quicktime/qtv/letsrock/
Normally, the page will load with placeholder prior to the event starting, and not the default "looking for something" splash page used for bad links. However, They could have changed tactics since event pages are now often shared on places like Macrumors and Digg.com now.
Cheers!