Technology entrepreneur Aaron DeMello has wines in his 2,000-bottle cellar he just doesn?t want anymore. What to do with those big Aussie shirazes and Napa cabs now that he?s mostly a Burgundy guy? Vinfolio Marketplace, an online wine market going live on July 1, is the latest answer.

With a click on his computer screen, DeMello, 34, can add his unwanted wines to a virtual inventory of almost 12 million bottles, valued at $2 billion, held mainly by North American collectors. Participants can legally offer wines from their own cellars or place bids to purchase from others. ?It?s a game changer,? DeMello said by phone from Montreal. ?It?s like a commodities spot market for wine.?

Many bottles in the store come from the private cellars of the 53,000 wine lovers who use the company?s free Web-based cellar-management software, VinCellar. Most barcode each bottle, adding new purchases and subtracting consumed wines by waving a wand-like scanner. Users can access their inventories over the Internet.

To increase numbers, VinFolio partnered with Seattle-based CellarTracker LLC, the leader in online cellar-management software founded by former Microsoft engineer Eric LeVine in 2004. ?The 82,000 CellarTracker users collectively own 9.6 million bottles of about 400,000 different wines,? said LeVine, 39. The community has a strong wine-geek social element. Members have posted about 250,000 tasting notes of their wines, which include everything from 47,000 bottles of classic Bordeaux Chateau Leoville-Barton to 7 bottles of Sula Dindori Reserve shiraz from India. The largest US retailers, such as Zachy?s, list only about 5,000 labels.

Unlike existing online wine sites like Snooth, which connects consumers with wine merchants and producers to help them compare prices, Marketplace?s focus is on facilitating sales between collectors who can?t legally do so alone without a liquor license. It took me only five minutes to register for a VinFolio account on the website and enter several wines in Vin Cellar (I could have used CellarTracker), all for free. A couple more clicks and I?d marked two for sale.

Sellers can offer one bottle or 1,000, list a price or not, set a filter to screen out low offers, and accept a bid only when they?re happy with the price.