Someone posted the following on Audiogon a short while back on this very subject. It's worth a read prior to un-grounding your system.
http://www.aes.org/sections/pnw/pnwrecaps/2005/whitlock/whitlock_pnw05.pdf
http://www.aes.org/sections/pnw/pnwrecaps/2005/whitlock/whitlock_pnw05.pdf