Today’s featured promo on MacUpdate offers Xyle scope 1.1.8 for US$11.95 (40% off, retail $19.95). “Xyle scope is an elegant analysis tool for everyone interested in Web standards. It’s like surfing the Web with an X-ray view. Using Xyle scope you will deepen your understanding of XHTML and CSS, find out how your peers did it, and see your own work with fresh eyes.” Xyle scope requires Mac OS X 10.3.9 or later.