Sometimes google searches reveal quite intersting results. I've tried to search for Mail::CheckUser references on Internet and I found it being used in comercial product named Email List Cleaner. Well, I don't mind they use it but I find the fact that they sell this product for quite high price $197 rather ..hmm.. amusing. From its online demo this product looks like quite simple CGI wrapper for my module which hardly costs such money. I guess it would take me maximum 4 hours to write similar CGI wrapper including tests and documentation.
