Microsoft's ambidextrous mouse

Sidewinder X3
It’s an eight-button(!) gaming device, usable with either hand and sports a 2,000 dots-per-inch laser-tracking engine with “on-the-fly” dpi switching between high, medium and low sensitivity and a single thumb button.
Best of all is the price. The X3 will retail for $39.95 when it officially ships in May.
But, if you can’t wait that long you should soon be able to pre-order your X3 on Amazon.com.