Following a teleconference between the competent ministers of Greece and Switzerland, the two states agreed on the conclusion of an agreement, modeled on the agreements that Switzerland has already entered into with Germany and the UK. 
No further details are yet available. Both the agreements Switzerland signed with Germany and the UK however make it easier for the German and UK tax authorities to get information about and revenue from their respective residents that keep bank accounts in Swiss banks. 
In principle the agreement provides that Switzerland will maintain the bank secrecy and at the same time it will withhold tax that will be paid directly to the Greek tax authorities.

Greece exempts from taxation on the transfer of real property the acquisition of a first residential real property by Greek tax residents and Greek nationals, upon satisfaction of certain requirements.
In a recent decision the Administrative Court of First Instance of Piraeus (Decision No. 48/2010) ruled against the tax authority who denied the tax exemption to a couple of Vietnamese nationals that are permanent residents in Greece. The Court stated that the critical requirement is the tax residence and not the nationality of the person requiring the tax exemption.

European Commission, Press Release IP/11/635 of 24/5/2011 

Different taxation of casino entrance fees
In 2009 the Commission received a complaint alleging that the taxation of admissions in casinos in Greece is discriminatory and entails state aid in favour og the public casinos (C16/2010). Under Greek law admission tickets are taxed a uniform 80%, but the price of tickets which is regulated, is €6 for state-owned casinos whereas private ones are required to charge €15. This means that private casinos must pay a €12 admission tax per person (80% X 15) to the state, while public casinos (and also a single private casino exceptionally assimilated to the public ones) only pay €4.8 (80% X 6).