An interesting side note to all those who tumble dry towels. It actually causes towels to wear out a lot quicker than if you line dry them. They lose absorbency much quicker (and are never as absorbent after each wash as a line dried towel would be).
I don't mind towels line dried and never tumble dry mine. They are actually more absorbent if line dried. Plus the cost of electric and environmental wotsit factors me for too.