Another thing that you could try... instead of setting the keyboard flat on your desk, put a piece of cardboard, or maybe that rubber shelf liner stuff, on your desk and then set your keyboard on that. I have a piece of shelf liner at home that I use anyway because it keeps my Cherry boards from sliding around on my desk, they're so light and plasticky that they do tend to move around. Both at home and at work I also use a wrist rest with a built in platform for the keyboard and mouse, like this
http://www.newegg.com/Product/Product.aspx?Item=N82E16826999048I like that kind of setup for several reasons; if I need to clean off my desk to do something that doesn't involve using the computer (writing something, fixing something, whatever) I just pick up the whole thing and move it. Secondly, it does make the keyboard quieter as it doesn't couple the keyboard directly to the desktop surface, and the platform is some kind of heavy fiberboard type stuff that seems to dampen noise. Now it won't make a Model M quiet, mind you, but my board with clears is really quite quiet sitting on top of it. Finally, when I actually do set my hands down on the desk, it doesn't scratch up the clasp on a watch bracelet. (I know, that's a silly thing to get anal-retentive about, but so be it.)