Well if you think about it, the two things couples fight about is sex and money.  I have written several posts about sex, so a money post had to follow...  My father gave me the best marriage money advice ever when I announced my engagement and I feel like it is worth sharing.

MrTheHusBlog (My Father) Definition Pause : The Four Bank Accounts for Your Marriage

• The Household : This is the receiving account for all the money.  Your pay check(s) should be deposited here.  This is the account with the most activity.  Groceries, gas, medical bills, etc. come out of this account.  In short if "you both need it," then the money comes out of this account.
• Savings : Any money left over after bills, private accounts (see below), and incidentals goes into savings.  Also you should set a certain amount that goes into saving automatically.  Let me also be state that your 401K does not count as savings here.  This savings should be for both extra investing, and an emergency fund for unplanned expenses.  
• His Private Account : Each pay period the Husband should receive a small stipend into an account that the wife cannot see.  This is HIS account and he can do whatever he wants with this money.
• Her Private Account : Each pay period the Wife should receive a small stipend into an account that the husband cannot see.  This is HER account and she can do whatever she wants with this money.