Michael Cyger introduced me to DomainLeads.com, a recently launched domain industry tool created by the company operating Estibot. DomainLeads.com is a tool that helps identify the number of registered and developed TLDs (extensions) in specific SLDs (keywords or phrases). For instance, I can see the Logical SLD is registered in 134 extensions, and 13 of those are developed websites.
I think this data is critically important when it comes to understanding potential prospective buyers and determining the value of the .com domain name.