Well, look at it this way:

The 2003 105 grouppo (Levers, brakes, cassette, Crank, bottom bracket, chain & Derailleurs) weighs in at ~2,600 grams (or 5.75 lbs)

The Klein frame weighs in (assuming a 55cm size) at ~1,450 grams (3.25 lbs) and the fork weighs in at ~450 grams (1 lb)

The Ksyrium Elite's weigh in at ~1,750 grams (3.85 lbs)

So far this equals roughly 14 lbs

Now add the weight of these items:
Saddle:
Post:
Clamp:
Headset:
Tubes:
Tires:
Rimstrip:
Bars:
Stem:
Tape:
Cables:
Cages:
and any other doo-dad you have on your ride...

Voila, that's what your bike weighs.

WARNING:
BE VERY CAREFUL about contracting the "weight weenie" syndrome. This is a particularly virulent and nasty disease that can have disasterous consequences on your wallet!

I caught the bug and it has taken practically ALL of my excess funds. It's like I am a gram junkie or something. I should probably check myself into the Betty Ford clinic.

*on the plus side my bike is closing in on the sub 16lb barrier