http://cisco.netacad.net, the main page of the Cisco Networking Academies, shows the number of students currently enrolled. It seems this information is updated every few days.
Right now, we just passed half a million students (worldwide).
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)