Hi Bart.
Sorry about that, guess I got a little exited! I currently charge a flat rate shipping fee. Haven't configured any shipping by price/weight etc. I'd rather not use that workaround (that's if it still works on v2.3+) about giving fee shipping on products with 0 weight (as I am adding other products with 0 weight that will need shipping fees), but worst case scenario I will have to.
In regards to modules, if you're talking about shipping modules then none.
Is that enough info?
If you want I can PM you my store URL :)
Hate to be cheeky buddy but do you mind taking a look at this also: http://www.oscommerce.com/forums/topic/376326-how-to-sort-product-listings-on-category-view-in-ascending-order-by-price/
I'm more than willing to give you a little cash for your troubles as a goodwill gesture :)