Liv-ex is the London-based electronic trading platform for fine wine that has grown into quite a resource of information on fine wine prices and market trends. The movement of the price index of their top 100 wines is shown here since the beginning of 2006, for example. Looks as though it's set to fall further, don't you think?
As well as offering overstocked merchants a chance to offload vintages they may have gone too long on and generally trade between themselves under a cloak on anonymity, Liv-ex offers various packages of information to private collectors that include detailed monthly reports...