IQ Tests
Are you brilliant? Find out by taking a free PhD-certified IQ Test

Children and Adult IQ Tests
A couple of Free IQ tests and links to where you can find a Children's IQ Test

Majon's Online IQ Test Section
I like the music too!

Mensa International: Mensa Workout
A 'non-IQ' IQ test, biased in favor of English-speaking people.

Cerebrals.com
Cerebrals Society gathers exeptionally gifted individuals (+ or = to 144 IQ). Try their tests!

AdultFriendFinder.com IQ Test
An IQ test that asks for your romantic preferences at the end!

IQ Test for Children
(various children's IQ tests from under 7 to 15 years olds)  

IQ Test
www.AllTheTests.com - The IQ-Test

Uncommonly Difficult IQ Tests
Very difficult IQ tests