Something better than GraphViz?


GraphViz feels like a pretty old tool that generates only mediocre charts. Not very visually appealing. Plus, my DOT language skills are lacking.
Can we move to a better graphing tool? Since we have the hierarchical data already defined, it should be easy to move to a different graph visualizer. If there's a tool out there -- some kind of chart control, silverlight control, WPF control, etc. could provide a better visual graph, please let me know, I'm open to suggestions.