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Put idle savings to use while keeping them liquid
First of all, look for a savings account with a decent interest rate. Online banks are good at offering those, and you can transfer your money back and forth from the checking account with a couple of business days' delay. ING Direct offers 1.1% APY right now - lame, but much better than nearly-nothing. If you'd like a little nicer rate of return you should also consider putting some of the money (the part you need least) in a short- or intermediate-term bond ETF or mutual fund. You can sell them quite readily, they pay more interest than a savings account, and because of the shorter maturities involved the interest rate risk is limited. (That's the one that makes your bonds less valuable now because the rates went up after you bought them.) I have some NYSE:BIV that's yielding 3.8% or so.