Logitech's MX Revolution mouse revoltionizes mousing
Here's a preview of Logitech's upcoming MX Revolution mouse
that basically adds a multi-function scroll wheel. You can use it in two ways by having it either engaged or disengaged. While engaged, the wheel clicks, letting you tightly control you scrolling. Disengaged, the scroll wheel is "loose" letting you spin it once and have it keep going on it's own. Allowing you to scroll further, faster. It sounds cool and it looks like it fits like a glove.