Money is the root of many many arguments...
This spinster (old maid) would tell you that it would be best to:
From each seperate paycheck:
1. Pay into your retirement fund individually.
2. Each put a percentage into the house/bills fund based on what you spend per month and what you earn per month. The one who earns more money, puts in more.
3. Your personal allowances - this is how much money you can be frivolous with per week - for lunches, for shoes, for whatever... the spouse can't question what that money is used for.
4. The shared fun fund... this is your savings fund for a new car, awesome vacation, whatever where you each contribute a percentage.
5. The college fund. When you start to hear the pitter patter of little feet, start to put away a percentage of money aside. Looking into high interest accounts that you won't touch.
If you go by percentages, then it's not to big a burden, and don't forget that allowance-- you still want some monetary freedom to do what you want with a percentage of the money.