The GLAT (Google Labs Aptitude Test) is about technique and creativity :

.. Creativity
* Question 2 : Write a Haiku describing possible methods for predicting search traffic seasonality
* Question 9 : This space intentionally blank. Please fill it with something that improves on emptiness.
* Question 14: What will be the next great improvement in search technology?
(by the way a good to have ideas!)
* Question 15: What is the optimal size of a project team above which additional members do not contribute productivity equivalent to the percentage increase in the staff size?
* Question 21: In 29 words or fewer, describe what you would strive to accomplish if you worked at Google Labs.

..Technique
* Question 1: Solve this cryptic equation, realizing of course that values for M and E could be interchanged. No leading zeros are allowed. WWWDOT - GOOGLE = DOTCOM
* Question 3: 1, 11, 21, 1211, 111221. What is the next line?
* Question 8: How many ways can you color an icosahedron with one of three colors on each face?
* Question 12: In your opinion, what is the most beautiful math equation ever derived?
* Question 17: Consider a function which, for a given whole number n, returns the number of ones required when writing out all numbers between 0 and n. For example, f(13)=6. Notice that f(1)=1. What is the next largest n such that f(n)=n?

All the questions and answers @ the Google Story