Gleefully Killing Clerics Since 1981

First off I would like to tip my hat to the RPG'ers who voluntarily play healers in adventuring parties.  They rarely get awesome treasure or have bards compose lengthy biopic songs about them.  But, they are extremely important! 
     The newest incarnation of every one's favorite RPG has brought some healer issues to the forefront.  The main one is that "You can't kill a 4th Ed. Party that has a good cleric/healer."  Now this might be a tad overstated, but in a balanced encounter the players will always have a huge upper hand.  Is that so bad? Yes.  It makes combat extremely boring and sometimes painfully so. 
     So how do you change that.  You can tweak the monsters, give them regenerative powers and action points among other things.  But, that has the unwanted effect of extending the combat.  The easiest and most efficient way is to go after the cleric.  You certainly don't HAVE to kill them, but you should definitely make them a focus of the bad guys.  When the healer is more worried about his own ass, he becomes less of a healing machine and more of a real party member.  This makes combat more fun, and makes the time fly by.