A friend of mine told me about a site I didn't see before: flybilligst.com. It simply shows you flights to different destinations by the use of a price graph. Nothing new, but this one's targeted eXactly where my family flies, when we do. AND, it's simple!
Yesterday we booked a trip to Pisa, Italy - 2 adults and 2 children - for NOK 456,-. Nice! It was a lot of fun surprising the two oldest last night ;-)