I have a funny garden with sloping sections and odd shaped flowerbeds and I recently bought a Bosch Rotak which is brilliant. I wrote a full review of it here - www.squidoo.com/bosch-rotak-lawnmower
Those weed burners are also really excellent for burning off several decades worth of paint on old wooden stairs - where nitromorse failed the weed burner prevailed!
Creocote isn't bad but not as good as the original. However, I have found that mixing creocote half-and-half with used engine oil seems to preserve the wood as well as Creosote used to.