XMMS redraws its window far too often as it's dragged around the desktop, with the result being that its window lags behind the pointer and keeps dragging around long after I've stopped dragging it. This is on a Matrox G200 on XFree86 4, so it's not a case of the video card being suboptimal.
Don't drag it over netscape. (Yes, I know, that's not really a *fix*, but it helps.)
I'm marking this as a WONTFIX, as it's very unlikely that we'll modify the xmms drag code here. You might ask some of the xmms.org people about it.