I too had this most extremely irritating problem. It completely ruins your Mac experience. There are many other horrifying details of what this does to your Mac. Not only can you not trash things properly, you can't even move files or rename them. Every single click on a file to rename it, opens it. You can't drag windows without them collapsing into the dock, and clicking the red button on a window's top to close it, will minimize it into the dock. I was so frustrated & increasingly LIVID! Just when I was about to phone Apple & complain.... I thought... why not search "os x 10.6.6 mouse problems single click double click"
that brought me here...
Now, after following the advice presented here (in Mouse Preferences - turn the Double Click speed up to maximum), the problem is SOLVED. It's nothing to do with your mouse, or your motherboard. Trust me, try that suggestion.
Yes, it's completely counter intuitive, I would bet most of you that had this problem, during your attempts to thwart it, tried lowering the double click speed in that preference panel. I know I did. Never even thought to max it out. After I found that maxing it out, removed the problem, I've been able to back the slider off from the max position by about one notch. Now all is well with my mice; Apple magic wireless & Logitech Marble Trackball.
Now, that's enough fussing with you silly little mice, learn to behave or I'll bring the cat in here....