To be clear - everything I have is Jeanie's, and everything Jeanie has is Jeanie's.
Seriously, we share absolutely everything. We divide household responsibilities along traditional lines, and find it a lot easier to just keep separate accounts. Nobody is hiding anything, but we're not combing through the expense accounts either. Living below our means makes a lot of “fuzz” possible.
The separate accounts are just a way for us to keep ourselves in check - she knows what she needs to be happy and so do I. We discuss the inflow, not the outflow - how much is enough. What each of us does with what we have decided together is "enough" is no longer a matter of debate.
I did this with everything that matters. My kids college money. Their weddings. Everything.
It works.