In addition to new iMacs, Apple also introduced a new multitouch mouse it calls the “Magic Mouse”
From Apple’s website:
Seamless Multi-Touch Surface
… The Multi-Touch area covers the top surface of Magic Mouse, and the mouse itself is the button. Scroll in any direction with one finger, swipe through web pages and photos with two, and click and double-click anywhere. Inside Magic Mouse is a chip that tells it exactly what you want to do. Which means Magic Mouse won’t confuse a scroll with a swipe. It even knows when you’re just resting your hand on it.
Magic Mouse uses powerful laser tracking that’s far more sensitive and responsive on more surfaces than traditional optical tracking. That means it tracks with precision on nearly every surface — whether it’s a table at your favorite cafe or the desk in your home office — without the need for a mousepad.
Magic Mouse connects wirelessly to your Mac via Bluetooth, so there’s no wire or separate adapter to worry about. Pair Magic Mouse with your Bluetooth-enabled Mac and enjoy a reliable and secure connection up to 33 feet away. When you combine Magic Mouse with the Apple Wireless Keyboard, you create a workspace free of annoying cables.