Today, Logitech announced a new device called the NuLOOQ (pronounced "new look") Navigator, along with a software component called the NuLOOQ Tooldial.
If you've ever been bothered by the annoying need to pan and zoom and move your mouse all over the screen to select tools and functions from menus, this is the answer you've been waiting for. I've been lucky enough to have beta tested this device and have one sitting on my desk at the moment. It's a fabulous device, meant to be used as a non-dominant hand device. That means you still use your mouse or pen, but your other hand controls this device.
You can find a small video testimonial from me here, and you can also find some presets that I've created for the Tooldial here.
The device is optimized to work with Illustrator CS2, Photoshop CS2 and InDesign CS2 (it won't work with older versions) and it allows you to focus more on the work that you're doing. I found that after a few minutes of using it, I wasn't consciously zooming or scrolling anymore -- that all seemed to happen by itself.