Wolfram Alpha, what is the meaning of life?
Update: Wolfram Alpha, what is the velocity of an unladen swallow?
Update 2: it gets even better. Click on velocity of a European swallow, above, and you get the actual speed. More easter eggs below:
How many roads must a man walk down?
How much wood could a woodchuck chuck?
Why did the chicken cross the road?
Please add any other found easter eggs in the comments!
Update3: Josh Gans seems to be tweeting Alpha eggs! He found this one.
Update4: Technewsreport finds a few more.