paint4blood, it may not have been wowmatrix or skada. Don't point fingers unless you have incontrovertible proof to back it up, please. Not fair to ruin someone's reputation when you don't know for sure.
If you were keylogged, it could have been as long as six months ago. They almost never hit an account
as soon as they get the info. It usually takes
at least a couple weeks. It could very well have just been a brute force/dictionary hack, too, no keylogging involved at all.
You need to contact Blizzard's Account Support department to get the ball rolling on getting your account back. Then you need to run virus and malware checks on your system, to make sure it's clean.