Something is very wrong here. Right after starting a KDE session everything looks normal.
But after running for a day we have a different story. I'm assuming this isn't the expected behavior (if so I didn't expect it).
This time I specifically took a screenshot to prove it, but I've seen it eat up as much as 1.3gb of my memory, which is rather unnerving.
kwin-kde4 4:4.0.4-0ubuntu1