I'm using 1.5.5e

Just wondering if there's any such thing as a module or some code I can use to stop shipping being applied at all for a selection of categories that don't require shipping. I know I could use Free shipping but I just want some products to bypass the shipping page or say something else.

I'm aware also I could clone a Free shipping module - potentially I could do this and put a different message for these products.

Just need some advice as these are digital web hosting products and don't require shipping.