The most common reading is not the literalism a modern reader might think, but the inclusive reckoning of three day-night (or in Jewish methodology, night-day) periods. This was a common usage in Jewish religious observations. So the little bit of Friday and the little bit of Sunday in Christian tradition which passed between Jesus’ entombment to His miraculous resurrection was enough to make up three night-day periods.
To make a long story short, I agree with hubel458 and respectfully disagree with HiTech RedNeck.
Twist it all you want in an attempt to fit the traditions many of us grew up with, you cannot get three nights out of a Friday crucifixion and a Sunday resurrection.