Tim Berners-Lee, the man credited with creating the World Wide Web, recently said that his only real regret about the whole shebang is forcing people to type out the (essentially unnecessary) double slash before the 'http' in URLs. Speaking at a symposium on the future of technology, he noted (in reference to the dreaded marks) the paper and trees people could have saved from writing out the marks, as well as the human labor spent in the typing of them. Hey Tim: don't sweat it! You've done us enough good turns that we're willing to overlook it.
Link:
World Wide Web creator sorry for the ‘//’ and other things that don’t matter