In a recent extensive survey by Wine Business Monthly, it was found not surprisingly, that natural cork remains the closure of choice but screw caps are reaching parity with other alternatives. The oxidative quality of cork and the possible reductive potential of screwcaps continue to be an issue wine makers struggle with.
Eventhough screwcaps have become much more acceptible by the wine consuming public in North America, it is still not the closure of choice in most European wine regions. A smart new way to stopper a wine bottle that is making inroads is the ZORK closure from Australia. ZORK is a revolutionary new wine closure that seals like a screw cap and pops like a cork. An interesting video on the Zork closure can be seen at this site. A delightful Cabernet Sauvignon under Zork is the Red Knot Cabernet Sauvignon 2004.
The good thing of course is that when all this closure problem is sorted out we'll find that there will be a host of new and effective ways to close our favourite wines. In the meantime as Jancis Robinson, one of my favourite wine writers, states "I feel sure we are far from throwing away our corkscrews."