This from Larry elliot in the Guardian which seems to explain Papandreou's game plan quite well
http://www.guardian.co.uk/business/2011/nov/01/greece-referendum-eurozone-crisis"Papandreou, however, has two things going for him. The first is that while 60% of Greeks oppose more austerity (and the wonder is that the figure is not higher), 70% say they want to remain in the single currency. The fact that there is no real appetite for having the drachma back means that a referendum could be won. Electorates are notoriously conservative when it comes to plebiscites: they tend to opt for the status quo, and in this instance the status quo would mean swallowing the onerous bailout conditions rather than taking a leap in the dark.
The second card Papandreou has to play is that Greece is now a bigger problem for Europe than Europe is for Greece. The short-term outlook for Greece is going to be bad inside or outside the single currency, but the balance of risks is different for the other 16 members of monetary union. For them, the calculation is simple: would it be better to cut the Greeks some slack in order to prevent a disorderly default creating a domino effect across the eurozone? Or should they take a tough line, threatening to cut off all support in the event of a no vote? That is what is known as a no-brainer.
Why? Because the events of past 24 hours have made much clear: the sovereign debt crisis is getting more serious; the markets will remain turbulent; last week's rescue package is a dead letter; the chances of a euro breakup have increased.
All this is pretty obvious. What is perhaps less obvious is that Greece now has immense power as a result of its predicament. It has the rest of the world by the short and curlies."
And here's one from bookmaker William Hill:
http://www.williamhillmedia.com/index_template.asp?file=17986"WILLIAM HILL have slashed their odds for one or more countries to leave the Eurozone and revert to their original currency before the end of 2012 from 5/2 to 11/10 following news of the proposed Greek referendum. ‘Political punters are now betting that at least one country – probably Greece – will be out of the Euro before the end of next year’ said Hill’s spokesman Graham Sharpe.
WILLIAM HILL…ONE OR MORE COUNTRIES TO LEAVE EUROZONE BY END OF 2012 – 4/6 no; 11/10 yes."