You aren't the only one. Whenever there's an applet on a page, if I use a mouse's scroll wheel, it has a tendency to keep scrolling slowly in discrete, timely increments, even when the scroll wheel is still. It's odd that this occurs ONLY when an applet is running.
I am pretty sure it is Java's. Grr, it is always the last thing to load on the page and I think that is what is messing up my back button and typing in the reply box. I had to manually click in the box to type my message which I have never had to do before.
Anyway, it is a small inconvienience really and I will be very happy to see the Flash one instead since that will hopefully work better.
I tend to ignore everything at the top of the page anyway.