The Omni Group today announced a significant new release of their diagramming and concept visualization application, OmniGraffle. Version 5 has increased layout speed and new automatic layout options with the addition of the Graphviz layout engine. Many of the standard OmniGraffle tools are more powerful, including the line tools which can now create Bézier curves, making drawing and connecting objects more flexible. Additionally, the toolbar has been updated for easy access to common text and object formatting options.