is a site that, despite their name, specializes in predicting the dates for all upcoming Apple announcements. They are especially proud of their 100% accurate prediction of the
video-enabled iPod release.
I tried out the Pentium iBook and my prediction (Apr 15 2006) was within 2 days of the average (Apr 13 2006).
Maybe announcements come out on Wedsnesdays more often? Note that if you become a registered user, your vote counts twice as much as an anonymous one.