If Carl had the presence of mind back in 1998 and open sourced enough of the Rebol eco system to be useful for web platform development, then /index.r rather than /index.php might have been one of the most popular default documents in the world.<p>As an aside, you can tell how interested (or not) Carl is in the future of Rebol by the fact that he's clearly not reading and responding to comments in that blog post. Otherwise he'd have cleaned up the spam comments that have been posted there days ago.