In QuarkXPress 7 and 8, you can align selected items to a page edge by holding down Shift-Command (Windows: Shift-Ctrl) and pressing the arrow keys.
Give it a quick try.
(Note: if you use this shortcut on an item on the pasteboard, the item will jump to the edge of the pasteboard!)
Jay Nelson is the editorial director of PlanetQuark.com, and the editor and publisher of Design Tools Monthly. He’s also the author of the QuarkXPress 8 and QuarkXPress 7 training titles at Lynda.com, as well as the training videos Quark includes in the box with QuarkXPress 7 . In addition, Jay writes regularly for Macworld and Photoshop User magazines and speaks at industry events.