Back in the 1990s, during the dot-com boom, I knew people who got their first IT jobs merely knowing HTML. It was such a new technology that knowing it was enough to get your foot in the door. That won't work today, but I think that just demonstrating basic knowledge of HTML and SQL along with a moderate amount of Perl or Java knowledge could potentially get one an entry-level IT job. (I don't list source control because I'm rarely asked about this in interviews, but then, my interviews may not be typical)
What would most people consider to be the "minimum set of knowledge" today? My list is obviously Web-centric, but that's what I know best at this point.