Lots of great stuff from SMART on their Educator Resources page. For example, search by 8th grade Math lessons and you get 27 results of files you can download and use in the classroom. Also be sure to check out Smart Exchange.
It's becoming a common term (like Band-Aid, Xerox, etc) so it's tough to say but Smart holds a large chunk of the educational market currently with Promethean slowly creeping in on their marketshare. Unfortunately Promethean and Smart Notebook formats are incompatible as far as I know.