What are the dice for in Angry Birds?

The dice decrease by one each time they hit another object but are not destroyed. When they are destroyed, you earn 1000 times the number on the die. So the trick is to try and destroy them on the first hit, in order to earn 6000 points.

Just some (pretty) flotsam - they don't play any part other than being an obstacle.

(You'll find lots more of such things in later levels - only items like the crates of dynamite and balloons are "active".)

I believe that they are worth some points when destroyed.