There's little that shouts "seriously rich" as much as a little island in the sun to call your own. For Sir Richard Branson it is Neckar in the Caribbean, the billionaire Barclay brothers prefer Brecqhou in the Channel Islands, while Aristotle Onassis married Jackie Kennedy on Skorpios, his Greek hideway. Now Greece is making it easier for the rich and famous to fulfill their dreams by preparing to sell, or offering long-term leases on, some of its 6,000 sun-kissed islands in a desperate attempt to repay its mountainous debts.