Vasuvius - first, headset bearings don't wear out frequently if they aren't abused (i.e. - left out in the rain). Keep em greased and they will last the life of your bike - the don't get used that hard.

Second - try greasing your skewers, both of them. And tighten the front one a bit more than it is. I've had clicking noises caused by having my skewers dry - seriously, give it a try. It only takes a minute.