Your Mac's lack of a second mouse button means you have to Ctrl+click to get context menus and other "secondary click" options. Mac laptop users can stop reaching for the Ctrl key and secondary click by touching the trackpad with two fingers instead (then hitting the single mouse button.) In OS X's Keyboard & Mouse System Preferences pane, under Trackpad, check off "For secondary clicks, place two fingers on the trackpad then click the button." For more Mac tips, see weblog Hack the Day's roundup.