I don't know how many of you are noticing this but my driver's side window was rattling when open.
There is a rubber strip that fits in the rear channel that comes loose.
Remove the door panel and reattach rubber guide with adhesive.
To remove door panel
http://www.318ti.org/notebook/door/index.html http://www.understeer.com/window.shtml I would also replace the plastic clips as a precaution before the winter sets in. They are prone to breaking.