Traditionally, Irish people have harvested peat from the bogs for fuel to burn in the classic turf fire. In fact, one souvenir I saw at Carroll's was a bit of turf -- something for an emigrant to burn and be comforted by the smell of home.
As well as peat, wood that
has been submerged is valuable. Ancient bog oak is used for furniture and other artistic objects. In the picture below, piles of bog wood have been set to dry before being taken away.