Apparently this took place some time ago, but yesterday (Thursday) was the court date. Here's the full story and the outcome of yesterday:

Civil servant David Keogh and parliamentary researcher Leo O'Connor, both of Northampton, England, were charged with breaking the Official Secrets Act in the United Kingdom.
They then appeared in Bow Street Magistrates' Court on November 29, 2005 in London. They were remanded on bail, to return to the court on January 10 for a committal hearing.
The charges against them relate to the alleged leak of a document containing what purports to be a discussion between Tony Blair and George W. Bush at one point. It is alleged this document shows that Blair had to dissuade Bush from bombing Al Jazeera in Qatar.
On 10 January, their defence lawyer was shown the secret Al Jazeera bombing memo and declared it posed no threat to national security. He vowed to have it made public by the court. The case would return to court on January 24. (The Guardian) (San Francisco Chronicle)
The trial was due to begin on October 9 2006, however on that date, the judge ruled the hearing should be in secret. It is now reported that the trial itself will begin on April 18 2007. (BBC) (Guardian).
In arguing for the trial to remain secret, the government claimed the memo "could have a serious impact upon the international relations" of the UK. and that the "risk is of such magnitude to outweigh the interest of open public justice."
The trial began on April 18 2007 in the Old Bailey court. Elaborate procedures were imposed to ensure secrecy, including asking barristers to remove their wigs when restricted information was being discussed. (TheTimes) Few details have been published in the press.
On the 10 May 2007, Keogh was found guilty on two counts of making a "damaging disclosure" by revealing the memo and was sentenced to 6 months in jail. He was also ordered to pay £5000 in costs to the to the prosecution. O'Connor was sentenced to 3 months in jail.