I think this is something that KDE development should work on. There is a menu bar built into KDE, but I don't believe its customizable, at least not in 3.1.x. They've put so much work into the Kicker (the bottom default KDE bar), and they are working on it even more, so I think that it wouldn't be too hard to carry it over into the top menu bar. The new Kicker will be transparent for sure, I hope they implement a smooth zooming feature too
Then I can get away from using SuperKaramba for things like this and just use it for a sys monitor and weather app.