Ed - we're not running out of gas that fast!!  From a domestic perspective there is heaps of gas - and gasfitters services will be required for a long time to come.  It is a shame that this system as it works now is going to be handed over to MED who I think are making the framework up as they go along.  While there are a number of negative comments on this forum about the PGDB - the one thing that runs fairly smoothly is the gas certificate regime.  I fear the new system coming in around 2013 will mean it will be easier for member's of the public to be hoodwinked by un licenced tradespeople.  A record of installation can be done on an invoice, by a form a company or individual make up themselves - at least with the cert system now if you aren't curently licensed you can't even purchase a cert - so the customer has some level of assurance.  Like a lot of things - the baby has been thrown out with the bath water and I don't believe the users of this sytem i.e. the public and practitioners were ever truly consulted properly.  The men in suits have had a field day with this one - with the idea that it will reduce costs to consumers.   I'll eat my hat if that comes to pass.