When it comes to vector drawing programs for the Mac, there are only a handful of top-quality choices -- and while Adobe's Illustrator is pretty clear-cut as the professional option, the market for occasional dabblers and home users is small. Mapdiva, makers of cartography software Ortelius, have released a new entry in the vector field exclusively on the Mac App Store. Artboard features deep integration with all the core technologies of Snow Leopard, and boasts pen tablet support, Bezier curves, an extensive library of over 1600 styles and clip art and powerful text