This is not new for Apple, but it was a new discovery for me this past school year.
Apple has a product called the Magic Trackpad. Here's the link: http://www.apple.com/magictrackpad/
In trying to make students with impairments more self reliant, I worked with case workers and therapists for a student who has difficulty using a mouse. The trackpad on a laptop worked great, but the student had a hard time lifting the MacBook. I saw this and tried it on the student, it worked!
If you don't have bluetooth (required for the Magic Trackpad to work), you can purchase a Rocketfish Micro Bluetooth Adaptor and it works great on Macs with Snow Leopard (even though the packaging only shows Windows).
Link to Rocketfish: rocketfishproducts.com