B2B Examples
          Marketplace/Exchange models
                   DirectAg.com
                   e-Steel.com
          E-distributors - Grainger.com
          Service Provider - Employeematters.com
          Matchmaker - iShip.com
          Infomediary models
                   DoubleClick.net 
                   AutoByTel.com


          B2C Examples
          Store-front / e-retailing models
                    Virtual merchant - Amazon.com
                    Clicks & mortar - Walmart.com
                    Catalog merchant - LandsEnd.com
                    Online mall - Fashionmall.com
                    Manufacturer-direct - Dell.com
          Portal sites - about.com
          Dynamic-pricing models
                     Name-your-price model - Priceline.com
                     Comparison-pricing model - BottomDollar.com
                     Demand-sensitive-pricing model - www.mercata.com
                     Bartering model - ubarter.com
                     Rebates - eCentives.com
                     Offering free products and services - iWon.com
           Transaction Broker - monster.com
           Service Provider - whatsitworthtoyou.com
           Community Provider - iVillage.com

           C2C - eBay.com

           C2B - Priceline.com

           Singapore Government