The Medieval trading business is going to be well catered for in the coming months, as Patrician IV (see trailer below) is out next month, and Kalypso have - in partnership with Gamigo - also just announced Patrician Online. They explain: "The browser-based game, which is planned for 2011, will be based on the well-known trading simulation series The Patrician. Thousands of players can experience the glory days of the Hanseatic League and build up their own trading empire. The focus of the game will be on trading goods between players and creating effective production chains."
My production chain is particularly effective. That's what I tell the ladies, anyway.