Oh, the one-button mouse. You either love it or you hate it. Veteran Mac users adore the elegance and simplicity; switchers bemoan the loss of a second (or third) mouse button. Of course, the problem is easily fixed by either holding down the Control button or -- wait for it -- buying a two-button mouse.
On a laptop, you've got another option. MacSupport points out this simple method of using a "two-finger tap" in place of a right click. To set things up, follow these steps.
In the Keyboard & Mouse preference pane, select "Trackpad Gestures" under the Trackpad section. From there, select "Tap trackpad using two fingers for secondary click" and you're all set. Now, tapping the trackpad with two fingers will execute a right click.