Sara Moultin (sp?) is left handed and addresses that issue at times on "Cooking Live" you may want to watch the show and see which brand of knife she uses or watch the credits at the end-they usually list the manufacturers of clothing, and equipment. Good Luck.
I wouls assume that most knife brands such as henckels, wusthoff trident, messermiester, furi, and almost any other save the japanese brands would be leftie compatible. I worked with two left handed chefs in the last kitchen I was in, And they used the same mundial knives as everyone else. But japanese knives like global, mac, and others are flat on the left and the entire edge is on the right hand side, just like anneke said. If you wanted the same thing you could probably call up a well reputed knife sharpener in your home town and get him/her to tailor your knife for you, Im sure they'd be much obliged