A bishop pair is worth more than 2 bishops simply added together though.
That's what strong computers and strong players say. Rybka gives .4 advantage to an otherwise even position if one side has the bishop pair. It can help you have a better middlegame and endgame but in practice might not really matter.
I think there is three types of chess players:
1. those who think bishops is better than knights
2. those who think knights is better than bishops
3. and those who try to teach the other two groups that IT DEPENDS ON THE POSITION!