Thanks for your input on my shipping rules prob.
One good turn deserves another. You add the new eCart object to a page by placing "add to cart" buttons onto the page - Insert Menu, WebAssist, eCart, Add to Cart Button. If you have more than one eCart you'll be given the option to select which to use for the buttons.
I've just been doing the eCart stuff, so its still fresh in my mind ... I'll soon forget it again !