Well, after making this long post about how I was going to refinance my house, we decided not to do it. Even though we're paying the stupid tax of interest in doing a 30 year mortgage rather than a 20, we decided not to pay stupid tax of the closing costs and new interest payments.
Joe Kumor's comment about not raising your payment when you're about to have a kid also influenced our decision.
So, we're going to (sometime soon, anyway when we get a baby budget figured out) simply add the extra amount that the new refi-ed payment would've been to our current payment. If we follow that plan, we'll still pay off our house in 15 years from now. How awesome would it be to have a paid-for house about the time Dawson is in High School?