It might have been there in the back of his mind/administration, but I don't think Dubya was jonesing for military action against Saddam 'til after the WTC attack:
Powell's new plans for Iraq
At the end of a rapid Middle East tour, new American Secretary of State Colin Powell said the message he had heard from Arab leaders was that overdoing it with UN sanctions gave President Saddam Hussein a tool to use against Washington.
Mr Powell intends to have a modified sanctions package ready within a few weeks.
(Tuesday, 27 February, 2001)
Rumsfeld: Iraq may be target
US Defence Secretary Donald Rumsfeld says he cannot rule out military action against Iraq in the US-led war on terrorism.
[...]
However, British Foreign Secretary Jack Straw dismissed the idea, telling America's ABC News he had seen no evidence to link Iraq with the 11 September attacks on New York and Washington.
(Sunday, 28 October, 2001)
Powell pulls back on Iraq
US Secretary of State Colin Powell has sought to calm speculation that the US is preparing to extend its military campaign against terrorism to Iraq.
In an interview with the BBC, Mr Powell said the US was aware of anxieties within Europe and the moderate Arab world, and insisted that no decision had yet been taken by President George W Bush about the next stage of the war.
(Friday, 30 November, 2001)
US 'working to topple Saddam'
US Secretary of State Colin Powell says Washington is determined to see the Iraqi leader, Saddam Hussein, removed from power.
Mr Powell told a global youth forum organised by the MTV television network that the Iraqi regime had to change or be changed.
[...]
Mr Powell said while President Bush was working to achieve this by peaceful means, he was keeping all options open.
(Friday, 15 February, 2002)
Powell rejects Iraq inspections offer
The US Secretary of State, Colin Powell, has dismissed Iraq's call for talks on the resumption of UN weapons inspections.
[...]
President George W Bush has called Congressional leaders to the White House for talks about Iraq later on Wednesday, in an apparent attempt to drum up domestic support for a possible US attack.
The UK Prime Minister, Tony Blair, earlier gave a clear signal that he will support US military action against Iraq if Saddam Hussein fails to give unrestricted access to United Nations weapons inspectors.
(Wednesday, 4 September, 2002)
Edited for unnecessarily neurotic layout considerations