Well, actually I thought ShadedBorder is kind of discontinued (in favor of LiquidCanvas)… But I proofed myself wrong and here it is: The first update for ShadedBorder since 1.5 years!
It fixes the a IE8 1px overlap bug and comes with a performance optimization for every browser supported: The ShadedBorder nodes will only be cloned on demand.
Grab version 0.6.2 now at the ShadedBorder project page.