http://www.volkskrant.nl/buitenland/1130561868303.html
Okay here we go. I'm sorry that it is in Dutch, but I haven't found the info in English yet. In short they say that Libby leaked the identity of a CIA operative to a reporter. But his motives for doing so are far more interesting.
They say that it was done to discredit Joseph Wilson. Wilson went to Niger to check out the story that Saddam was buying uranium. Wilson said that this was unfounded and therefor no true.
Libby and his WHIG (White House Iraq Group) were working the public over the make it a just invasion. When Wilson didn't cooperate and stuck his view that Iraq's threat was intentionally overstated. By saying Wilson wife works for the CIA they tried to discredit him too.
If the public heard that there were no weapons of mass destruction, why invade Iraq? This story on bringing peace and democracy started when it became clear that there weren't any of such weapons. So, in my opinion, it has a lot to do with the war in Iraq. And if he is found quilty I hope they make him console the parents of those 2000 dead GI's that went there because he lied to his own country and to them!