Face each other during the ceremony as much as possible, if not ALL of the ceremony.  A lot pastors/officiants will have you face them during the ceremony...especially the important parts...DON'T DO IT!  Here's why...1) facing each other will calm each other's nerves, and don't you want to look in each other's eyes during the ceremony!?!?  2) Guests want to see your faces...not your backs!  3) The photos will be infinitely better if you're facing each other.  (I have a hard rule that I don't go behind the couple during the ceremony to get pics...I want to capture your ceremony, not be a part of it!).  It's your wedding ceremony...do what YOU want to do!