> Analog devices has some interesting isolation amplifiers that
> have the isolated DC to DC converter built in.

TI also have the Burr-Brown originated isolated amplifiers. See 
http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&familyId=512&uiTemplateId=NODE_STRY_PGE_T&paramCriteria=no 
for details (watch long URL). 

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