What about in science - you could put a plant (or other specimen) on the doc cam, hooked up to the SmartBoard and projector. Now you have an interactive opportunity to label the parts of your object or help students observe pieces they may not notice on their own.
Here is a website that will search smart-board lessons with state standards. On this page you can search by browsing curriculum standards or subject/grade level.
There seem to be endless possibilities!