Originally Posted by
chibibike
I just took off my headlight, lock, and gps mount and it made my bike 5lbs lighter...
You'll probably be disappointed by how little difference that makes, but every bit helps.
Are those Bontrager Hardcases you're running for tires? If they are, replacing the tires with something lighter/sportier will make a small but noticeable difference while improving your ride (though you will get more flats).