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There's a way to do a reverse lookup (with their email address) on DomainTools, but there's a charge for the service. It's pretty expensive, based on the number of current domains they have. It's not worth it, unless you're willing to spend over $100.
Last time I was using that DT service, it was about $30 per month. And yes, its a good way to find all domains matching 'owner' whois field, if no privacy is evolved.