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WMAP Three year data reveals that its contents include an estimate of 4% atoms, the building blocks of stars and planets. Dark matter comprises 22% of the universe. This matter, different from atoms, does not emit or absorb light. It has only been detected indirectly by its gravity. 74% of the universe, is composed of "dark energy", that acts as a sort of an anti-gravity. This energy, distinct from dark matter, is responsible for the present-day acceleration of the universal expansion.

5 year data reveals a somewhat more exact answer.

Credit: NASA / WMAP Science Team

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WMAP # 060916