For a great exercise to work your shoulders, try this:

1. Stand with your knees slightly bent and with your feet no more than shoulder width apart.
2. Keep your abs tight, chest up and back straight.
3. Hold 3-5 pound dumbbells (palms facing in) in front of legs, with elbows slightly bent.
4. Squeezing shoulder blades together and in a controlled motion, raise dumbbells up, keeping elbows fixed, until arms are parallel to the floor. Hands should not go higher than top of shoulders. (Please note: The guy in the photo is a little over zealous and lifted a bit too far. Don't raise arms higher than your shoulders.)
5. While maintaining the controlled motion, return to starting position. Do not allow muscles to relax before next repetition.
6. Do 3 reps of 10.

Fit's Tip: Build up your weights once you feel it is too easy.