Prevent BACKSPACE (requires jQuery).

backspace.js

// Prevent BACKSPACE
$(document).keydown(function(e) {
	if (e.target.type !== 'textarea') {
		var code = e.keyCode || e.which;
		if (code === 8) { //BACKSPACE keycode
			
			//e.cancelBubble is supported by IE - this will kill the bubbling process.
			e.cancelBubble = true;
			e.returnValue = false;

			//e.stopPropagation works only in Firefox.
			if (e.stopPropagation) {
				e.stopPropagation();
				e.preventDefault();
			}
			return false;

		}
	}
});

@brandonhenricks, fork, don't comment ;)