Withdrawals were 3 billion between Monday and Thursday alone, and the banks have asked the ECB for more liquidity assistance. One commentator said that if they didn't get it the banks might close on Monday.
I've been saying "take cash" for months, and frequently accused of "scaremongering." Now that the Greek crisis is high on the news agenda every day maybe people will recognise that there could be problems and inconvenience for a while.
Unfortunately, the situation is causing significant damage to Greek tourism. AgStef has a large loyal cohort of people who go back, but I know from contacts in the village that bookings are lower than hoped. If there is a banking melt-down, our Euros in hand will be be extremely welcome.