OCIA.net takes a look at the Logitech MX Revolution Cordless Laser Mouse in their latest review

What makes it even better is the different ways you can switch modes. You can press down on the scroll wheel at any time to switch between Click-to-Click and Free Spin mode. Even more interesting, the MX Revolution can detect the type of application that is currently active and adjust the scroll wheel according. Also, the wheel can automatically detect how "fast" you spin the wheel; if you spin it fast enough, it will automatically switch over to Free Spin mode then lock back into Click mode by itself! Of course, all of this can be fine-tuned in the SetPoint options seen above.

Logitech MX Revolution Cordless Laser Mouse Review