Berries have a short span of perfection after they're picked, but I came across a tip in the newspaper a few years back that really lengthens their keeping power. I use cloth rags in my kitchen most of the time, but I keep a roll of paper towels tucked away for just this season. Although it wonders me if cloth could serve this purpose too. . . .?
For any fresh berries:
Do not wash them.
Layer them in an airtight container with paper towels, removing any soft or spoiled ones as you go.
The goal is to keep the berries very cold and very dry. I've kept berries for over a week with this method!