i should have said "if you are a recreational rider." i know that i'm a serius weight weenie when it comes to by cyclo-cross bike, because i race 'cross and not road. for a cat3 racer, i can imagine 2 pounds would be a big deal. you're probably not carrying a lot extra when you're at your race weight, so the only place to lose it would be on the bike, or amputation [not a great option]. on the other hand, you probably have extra-light race-wheels, with lightweight tires and latex tubes to shave the pounds.
most recreational weight-weenies have to understand that, when you're talking about bike weight, you're talking about the combined weight of rider, clothing, bike and hardware. a full-dressed rider wighing 190 lbs in his kit, shoes and helmet riding a 16 lb bike, only has a 1.5% weight advantage over the same rider on a 19 lb bike.