Actually, I hate the idea of control-clicking, using more than one hand for a specific click seems to waste cumulative seconds of my life, so I bought a four-button trackball. ^^
I must agree, though, on one point. Apple's Mighty Mouse is a great idea and a great value, so if you're a switcher used to the right-clicking, go ahead and buy the Mighty Mouse. It's definitely worth it. 🙂