With Silicon Beach on and off, Startup Grind, lots of small meetups, and Fishburners in Sydney, there are certainly groups to build this community around but I still think we are years behind the critical mass of something like HN London. And that's just to talk about forums for people to gather in - it says nothing about our skills shortage.
I agree with Matt's points regarding our reliance on the resources industry. So many people head off to the mines on a fly-in-fly-out basis, and make incredible coin - but it won't last long-term and then our skill base will be incompatible with value-adding services industries.
However, I think we need successes before a great weight of people will shift towards STEM disciplines, in the same way that the dot-com frenzy saw Web Development course demand explode.