Quick update: We are working on setting up the shipping options in the stores, right now we are working on enabling calculated shipping with FedEx and USPS. In addition, you will be able to set up free shipping for over a minimum order, flat shipping rates for each product and flat shipping rates by order.
But we do want to hear more about the shipping services you use so we can account for all options.
I try to offer free shipping whenever possible, by minimum order sounds like a good option, but I would also like to have the option to offer free shipping only for certain items. Is it possible to set free shipping by weight?