The "cracking the window" thing you're thinking of is for tornadoes, presumably to help equalize the pressure inside the house and outside. That's not an issue in a hurricane - high winds that can propel a 2x4 through a tree trunk are your issue. And storm surge.
But, really, babes - if it's a Category 1 by the time it gets to you, you're talking winds just a little worse than when in the midst of a severe thunderstorm warning.
How far inland are you? By our experience in Katrina, if you're within a mile or two of the water (or of a good sized bay or such) - worry about the storm surge. Also, the further inland you are, the more obstacles the wind (and water) will encounter before it gets to you, so the less wind speed you will actually get. Be aware that your lawn furniture will go flying. Think about anything that has a high sail rate - something that's twenty pounds and wide, that wind can get under and catch, is more of a problem than your twenty pound concrete garden gnome is.
If you can board up your windows, that's great. You don't need to crack them, though.