Mapping del.icio.us with Anthracite and OmniGraffle

"Several people have asked me how I produced the visualizations that I used in my talk on del.icio.us. While those visualizations were constructed with a rather eclectic mixture of homebrewed code, assorted applications, and a good bit of elbow grease, I decided to put together a tutorial for people who might be interested in this type of visual exploration, but are not inclined to write custom Perl code to do so. Hence, I have selected a combination of two very nice applications for Mac OS X - Anthracite and OmniGraffle - to produce similar visualizations. Neither application is free, but both have free trial periods, should you be inclined to check them out. As an alternative to OmniGraffle, the excellent open source program Graphviz may be used, although it is less user-friendly than OmniGraffle. Finally, since the files that will be produced by Anthracite are in a simple text-based format (known as the dot format), a good text editor might come in handy for those people who want to modify these files by hand - TextWrangler is an excellent and powerful text editor, and is available for free."