Tough to know when Greece is going to exit the Euro.  I believe that Europeans have been buying time to kick Greece out.  However, they will only do so when there is at least some sort of safety net (an oxymoron if there ever was one, but the closest I can come up with to explain my thoughts).  The banks' exposure has been diminished since a significant portion of the debt on their balance sheets has been transferred to the IMF and other European public organizations.  As I understand it, this means that the hit will be spread about to the entire Euro zone, i.e. citizens of the euro countries.

IMO, Greece is on the way out, I have no doubt, the question is when not if.