According to his own words, his "investigation" was as follows:

The next morning, I met with Ambassador Owens-Kirkpatrick at the embassy. For reasons that are understandable, the embassy staff has always kept a close eye on Niger's uranium business. I was not surprised, then, when the ambassador told me that she knew about the allegations of uranium sales to Iraq — and that she felt she had already debunked them in her reports to Washington. Nevertheless, she and I agreed that my time would be best spent interviewing people who had been in government when the deal supposedly took place, which was before her arrival.

I spent the next eight days drinking sweet mint tea and meeting with dozens of people: current government officials, former government officials, people associated with the country's uranium business. It did not take long to conclude that it was highly doubtful that any such transaction had ever taken place.

Perhaps if he'd gotten off his ass and drank less tea, you know, actually doing some work, he might've found out what the British knew, as reported today in the Financial Times (with one significant error):

A UK government inquiry into the intelligence used to justify the war in Iraq is expected to conclude that Britain's spies were correct to say that Saddam Hussein's regime sought to buy uranium from Niger.

The inquiry by Lord Butler, which was delivered to the printers on Wednesday and is expected to be released on July 14, has examined the intelligence that underpinned the UK government's claims about the threat from Iraq.

The report will say the claim that Mr Hussein could deploy chemical weapons within 45 minutes, seized on by UK prime minister Tony Blair to bolster the case for war with Iraq, was inadequately supported by the available intelligence, people familiar with its contents say.

But among Lord Butler's other areas of investigation was the issue of whether Iraq sought to buy uranium from Niger. People with knowledge of the report said Lord Butler has concluded that this claim was reasonable and consistent with the intelligence.

President George W. Bush referred to the Niger claim in his state of the union address last year. But officials were forced into a climbdown when it was revealed that the only primary intelligence material the US possessed were documents later shown to be forgeries.

Actually, Bush said "Africa", not Niger in his State of the Union Address last year. Niger is but a small part of Africa, and that 1.77 metric tons of uranium recently removed from Iraq came from somewhere.