Could anyone give me some insight as to why heatsinks would be isolated
from ground planes?  My first thought would be to minimize emission or
absorption of noise, but I've never had a problem with this...that I
know of, anyway!

Also, has anyone had any experience with using a copper layer to
transfer heat from a heatsink to...(for instance an aluminum case).  The
heatsink is applied directly to the copper layer and a few inches away
the copper layer is attached to an aluminum case via a bracket.  (the
aluminum case is sealed closed).  Any insight would be greatly
appreciated!!!

Thanks,
Joe Reichert

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