It is interesting to speculate how the climate in Greece might be different if bitcoin had been more widely adopted there prior to this meltdown. No central control. No banks to close.
In some ways it might improve things in the short term as financial transactions could continue absent banking requirements, however in the long term I would suggest it would be a bad thing for the greek economy.
One of the major recurring themes of the greek economic problem, has been tax avoidance/evasion which has reduced the amount of money that the government have to support themselves.
With bitcoin's less traceable nature, it seems likely that it's introduction would make the job of efficient tax collection even harder, which would in turn cause even more problems for the greek economy.
Recent events in the Silk Road criminal trials suggest that governments have the ability to trace BTC transactions to a useful degree--witness the guilty pleas of two former federal law enforcement personnel for enriching themselves via extorting bitcoin. Yes, it does take a different mind set from conventional banking records, but ultimately everything is recorded in the blockchain.
Those were 2 very specific cases, I don't think you can usefully extrapolate to a government level ability to track blockchain transactions to real identities, especially when one of the main selling points of bitcoin transaction is that (if done correctly) they cannot be tied to a real identity!
One of the major recurring themes of the greek economic problem, has been tax avoidance/evasion which has reduced the amount of money that the government have to support themselves.
With bitcoin's less traceable nature, it seems likely that it's introduction would make the job of efficient tax collection even harder, which would in turn cause even more problems for the greek economy.