I don't know if this would be helpful - but when I bought my light wedge cover, the wedge was covered with a thin "envelope" of material that feels almost like a Styrofoam. I taped up the short edge of the "envelope" to make the sleeve more form-fitting, and I leave the wedge in the Styrofoam-like sleeve unless I'm actively using it.
Now, I switch back and forth between my regular cover (it's lighter and fits more easily in my purse) and the light-wedge cover (when I know I'll be reading in low-light conditions). But I haven't noticed any scratches on either the Sony Reader screen or the wedge yet.
I bought the wedge this summer, when we had those 3-, 4-, 5-day power outages in the midwest...
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