Here are some interesting quotes from Bush's speech to the U.N. making his case for war Source
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In 1991, the Iraqi regime agreed to destroy and stop developing all weapons of mass destruction and long-range missiles, and to prove to the world it has done so by complying with rigorous inspections. Iraq has broken every aspect of this fundamental pledge.

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From 1991 to 1995, the Iraqi regime said it had no biological weapons. After a senior official in its weapons program defected and exposed this lie, the regime admitted to producing tens of thousands of liters of anthrax and other deadly biological agents for use with Scud warheads, aerial bombs, and aircraft spray tanks. U.N. inspectors believe Iraq has produced two to four times the amount of biological agents it declared, and has failed to account for more than three metric tons of material that could be used to produce biological weapons. Right now, Iraq is expanding and improving facilities that were used for the production of biological weapons.

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United Nations' inspections also revealed that Iraq likely maintains stockpiles of VX, mustard and other chemical agents, and that the regime is rebuilding and expanding facilities capable of producing chemical weapons.

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We know that Saddam Hussein pursued weapons of mass murder even when inspectors were in his country. Are we to assume that he stopped when they left? The history, the logic, and the facts lead to one conclusion: Saddam Hussein's regime is a grave and gathering danger . To suggest otherwise is to hope against the evidence. To assume this regime's good faith is to bet the lives of millions and the peace of the world in a reckless gamble. And this is a risk we must not take.

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The conduct of the Iraqi regime is a threat to the authority of the United Nations, and a threat to peace. Iraq has answered a decade of U.N. demands with a decade of defiance.

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However, I was more moved by Colin Powell's speech source

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My colleagues, every statement I make today is backed up by sources, solid sources. These are not assertions. What we're giving you are facts and conclusions based on solid intelligence. I will cite some examples, and these are from human sources.

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Our sources tell us that, in some cases, the hard drives of computers at Iraqi weapons facilities were replaced. Who took the hard drives. Where did they go? What's being hidden? Why? There's only one answer to the why: to deceive, to hide, to keep from the inspectors./quote]

Well Colin, where are those outdated computers?
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Dr. Blix told this council that Iraq has provided little evidence to verify anthrax production...

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Perhaps that's because they weren't producing it.
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we have amassed much intelligence indicating that Iraq is continuing to make these weapons.

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Really?
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One of the most worrisome things that emerges from the thick intelligence file we have on Iraq's biological weapons is the existence of mobile production facilities used to make biological agents.

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And, how many have we found thusfar?