> they do. they rock. :) > Logitech Trackman Marble. don't leave home without it. :) I used to use these on all of my machines, however I just recently replaced them all with the Microsoft Trackball Opticals. 5 buttons + scrolly wheel, works great with Linux, and way more resolution and responsiveness than the Logitech. Works great for Q3 too. And the best part is that it's only $33 and not beige. http://www.us.buy.com/retail/product.asp?sku=10255981&hdwt=30804&loc=14577