If you've seen the Google April fools joke, it's a good one, but there is an Easter Egg. If you expand the browser further and further to the right the image of the Martian landscape keeps going. It should be mentioned that I have a dual monitor setup that extends 2560 pixels across. Now I haven't been able to reproduce this, but when you expand all the way out to 2560 a little text bubble appears at the far right on the martian horizon in the photo that says "Welcome to Mars. Nice monitor". So pay attention as you do it, and if you figure out how to reproduce, please let us know. Guessing it's a cookie thang.
Here is what it looks like on my screen (click the image for the full size):
I have yet to explore the questionnaires, etc. But you better believe I'm signing up.
I love April Fools.