Microsoft's mighty ideas for the Web
I remember a company in Redmond was also behind some ancient weblanguage, that was featured as tutorials almost everywhere and that has proven to be terribly bad... Anyone remember VBScript ? ;)
Also, they're not the only company behind XML, although of course they'll make the most out of their participation in defining it, like "How are you webmasters ? all your XML are belong to us. You are on the way to proprietary XML. You have no chance to be standards compliant make your time."
Back to the poll, I'd list the usual three there: XHTML+CSS, SQL, and a server-side language.