I’ve hosted a Who’s Using ColdFusion? list on this site for many years. It’s a massive user submitted list, but as it is user submitted some of the data is very out of date. (If you do know of out of date entries, let me know). Rey Bango has create GotCFM?, a site that allows users to submit the details about sites powered by ColdFusion (as well as 3rd party CFML engines).