Simulate touchpad or gestures on iMac I recently started using a MacBook Air and find some of the gestures such as the double click zoom in Safari extremely useful, I'm aware I can zoom normally using cmd - (+) but find the gesture zoom much better. Can I simulate the touchpad or another way to do this on my iMac.
You can use a Magic Trackpad with your iMac - that will let you perform all the same gestures as you use on your MacBook Air.

There are even neat accessories to make it one unit with your Apple Wireless Keyboard. The ones I know about are the Twelve South "Magic Wand" and the Henge "Clique".