EST bindings are for their EST boards. The bindings mount in a channel instead of the more traditional threaded holes in the board. If you see two long channels down the middle of the board than you need EST bindings. If you see screw holes than you need normal bindings.
Burton makes pretty much any kind of board and/or bindings you would ever need but you'll be paying a pretty penny for them unless you buy last years model or used.
P.S. You can fit normal bindings on an EST board, they sell an adapter for it from pretty much any other binding manufacturer. So if you want ride bindings, flow bindings, K2 bindings, etc. you can fit them on an EST board. You just can't use EST bindings onto anything other than an EST board.