I run another oscommerce store ([url removed, login to view]), which has been set up almost identically to www.jumporium.com. However, for some reason, the shipping part doesn't work on when the order reaches the checkout. It's almost if it skips the section completely, going straight to an order confirmation page. The shipping module has been set up in admin, so I just don't understand, and do not have the time to go through it all myself. The [url removed, login to view] site works perfectly, which makes it all the more frustrating.
Its probably easier to see yourself. I have set up a test customer (email:test @ [url removed, login to view] (remove spaces, it wouldnt let me post contact details, even though these aren't) , password: testing), so feel free to go throught the order process to see what happens. I can't set up a proper testing environment, but can supply any fiules needed.