One approach would be to try to limit your purchases of First Growths and even garagiste or cult wines, to reputable agents in France, London or the USA. This would include both auction houses and wine merchants. There are reputable agents in Japan and Australia, as well, but you're just adding another layer of cost, so it would be better to get closer to source with purchases from the first three I mention. Finally, if you are mobile enough to travel to France and other parts of Europe, like Switzerland or Germany, and have developed an information-gathering network of your own to where you can find out about them, keep a lookout for estate sales. Surprising finds can be made when a collector with a large cellar dies and his wife or someone else who is not as knowledgeable decides to liquidate any number of assets, including the wine, in expedient fashion.

You should also, of course, familiarize yourself with all the telltale signs of a forgery. Get to know the bottles, labels, capsules, color of the wine through the bottle, etc. for real bottles. And if the source of any bottle you're looking at can't be safely confirmed, be very, very skeptical. I currently live in Tokyo, and nobody I know here, either in the business or serious collectors, will buy any fine French wines from Chinese sources....

I know people in Japan who are using radio-frequency identification devices, and smart paper, as well, in place of or supplementary to barcodes on any number of products. Not wine, though. You obviously would need to talk to the great Chateaux of Bordeaux, very persuasively, to have that remedy implemented.

Because of my experience with magnetic strip products and smart cards in the past, however, I imagine at some point a really ambitious forger would be able to get ahold of the same type of devices, and machines and codes used to program them, as the devices implanted in any genuine bottles that did employ RFIDs, and thus would be able to counterfeit them, too. A cost issue, as much as anything else, but if the recent trends in pricing for First Growths and other premiere wines continue as they have with, say, the 2005 vintage year, then I'm sure some forgers will figure the effort and cost are warranted.

I'm not in the wine industry per se, but am an enthusiastic amateur who has been on its fringes for a couple of decades. I have helped out industry members with specific projects from time to time, as personal favors. My work has been more in IT-related areas, though I've been taking some time off recently.

Below are a small sampling of URLs from a *very* quick and dirty search regarding wine forgeries. I haven't worked with any professionals in this field, and know that even a little more time searching will bring further options. The first article is about forgeries in Italy, which is also facing problems in this area, not just regarding the most famous labels from Tuscany or Piedmont. The second URL points to a range of detection techniques. The third refers to some intricate techniques in Europe that involve measuring the occurrence of site-specific isotopes in wine samples, and some carbon-dating techniques under research in Australia for post-1954 vintages (these would, however, entail actual sampling of the wine).
1) http://wine90.blogspot.com/2007/10/italian-wine-fraud.html
2) http://www.wineauthentication.com/was/solutions
3) http://findarticles.com/p/articles/mi_m3488/is_11_82/ai_80234978/

All of these talk about techniques that are still in the R&D stage. In the meantime, I stand by the approaches I recommend in my first post.

So, we can conclude that buying from turstworthy sources is crucial. And we can see many people from Mainland China just buy luxury goods in Hong Kong.

And I believe our Goverment, wine industries players need to make sure the no fakes pledge before we can be the wine trading centres in Asia.