Well, since I've been following Mary Hunt's debt proof living, we've got several different "levels" of savings -
* Emergency Fund savings (she calls it a contingency fund - and suggests 3-6 months living expenses)
* Ongoing, but inconsistent expenses (property tax, irregular auto insurance payments, auto repair fund, appliance repair or replacement fund, clothing, home improvement) Each of these are divided into their own category (I have a spreadsheet that I track each account) This is designed to prevent using credit cards for major purchases. I think we'll need to add DS braces funds soon - both of them at once

!!
* Dream savings - vacation, retirement home, DH toys (boys and their toys just get more expensive

)
* Retirement savings (401k and retirement)
Sounds confusing, but it works for us!