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Actually I had downloaded an GUI for graphviz (dont remember the site), which said that they had won an Apple Design Award. But that tool really only displays an *.dot file I created. That's it. It's just called "Graphviz"... I guess that there are better tools around for using the Graphviz technology.
I tried this one: link text
Although they say that they won an Apple Design Award, I really can't see any special GUI there. Very poor interface.
Pixelglow looks like the site you're referring to.
I note they now offer an IPhone-enabled solution (!)