just in case you dont know cause you're new to macs...you can customize the mighty mouse so it does have a right click....
Thank you but that wasn't my issue at all. I use the right click regularly. It is just that it works in an unusual fashion. Because the Mighty Mouse only has 1 button but can register left and right clicks, Apple designed it to sense which finger was depressing the button.
Here is their design page describing this:
http://www.apple.com/mightymouse/design.html