On Mac 10.5 and above, you can get a right-click by double-tapping your trackpad with two fingers. Go ahead and try. (If you’re not already using a multi-button mouse, you literally don’t know what you’re missing.) There is all kind of functionality hidden in these “contextual menus”. Clicking nearly any onscreen item pulls up a new menu. Make sure that you have “Tap Trackpad using two fingers…” checked in the Trackpad section of System Preferences.