According to online intelligence agency Hitwise, the website took 10.3% of all traffic in the politics category, beating the and .
This figure rose to 27% on Sunday August 24, with 14% of visitors bookmarking the site and spending an average of almost seven minutes examining the 6,000 pages of evidence it contains, including emails, notes and memos.
The inquiry, headed by Lord Hutton, is examining the events leading to the apparent suicide of weapons expert Dr David Kelly. It has raised questions about the veracity of intelligence reports that the government used as evidence supporting the invasion of Iraq.
Traffic is likely to spike again with today's appearance by Prime Minister Tony Blair who at his appearance defended the government's dossier on Iraq and weapons of mass destruction telling the inquiry that he would have quit if it really had been "sexed up".
"It is one thing to say we disagree with the government, we should not have gone to war, people can have a disagreement about that ... but if the allegation had been true, it would have merited my resignation," Blair said.
The BBC, which is also at the centre of the inquiry because of the role of reporter Andrew Gilligan from Radio 4's 'Today' programme, saw its news pages providing 24.3% of the traffic to the Hutton Inquiry site.
There has been extensive media coverage of the inquiry, leading to some commentators speculating that public interest in the goings-on has been overestimated.
However, with crowds queueing at the Royal Courts of Justice in London for tickets to the proceedings and the high traffic to the official site, it appears that public interest remains high.
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