Wide Angle, Telephoto (2x) and Fish-Eye are three camera attachements for the iPhone (both original and 3G). They attach to the lens of your iPhone camera with the help of a magnetic ring that sticks to the body (see image above; for the plastic body 3G a metal ring sticks to the body and then activates the magnetic effect).
The $16.99 Wide Angle Lens offers a .67x zoom with Super Macro, also presenting the Telephoto (2X) Lens and 170 degree Fish-Eye.