"The new Magic Trackpad is the first Multi-Touch trackpad designed to work with your Mac desktop computer. It uses the same Multi-Touch technology you love on the MacBook Pro. And it supports a full set of gestures, giving you a whole new way to control and interact with what’s on your screen. Swiping through pages online feels just like flipping through pages in a book or magazine. And inertial scrolling makes moving up and down a page more natural than ever. Magic Trackpad connects to your Mac via Bluetooth wireless technology. Use it in place of a mouse or in conjunction with one on any Mac computer — even a notebook."
The other thing, and I guess all Mac users utilize this, is Apple's application, Grab, used to take screenshots. I use it daily, when I can't download something, and I want an image. It creates only TIFFs, which must be converted to JPEGs, at least for my blog postings.