Wouldn't surprise me if this were true. Although much is made of the story appearing before other news stories hit the press, it should be remembered that Saddam was captured on Saturday, not Sunday and that rumors certianly would have spread before the official news was made known. So it could be that they are just trying to take credit, or it could be that they in fact are the ones who captured him.
From Print Article: We got him: Kurds say they caught Saddam:
"However, in the early hours of Sunday, a Kurdish language wire service reported explicitly: 'Saddam Hussein was captured by the Patriotic Union of Kurdistan. A special intelligence unit led by Qusrat Rasul Ali, a high-ranking member of the PUK, found Saddam Hussein in the city of Tikrit, his birthplace.
'Qusrat's team was accompanied by a group of US soldiers. Further details of the capture will emerge during the day; but the global Kurdish party is about to begin!'
The head of the PUK, Jalal Talabani, was in the Iranian capital en route to Europe.
The Western media in Baghdad were electrified by the Iranian agency's revelation, but as reports of the arrest built, they relied almost exclusively on accounts from US military and intelligence organisations, starting with the words of the US-appointed administrator of Iraq, Paul Bremer: 'Ladies and gentlemen: we got 'im'."