I have aquired some input on the Zoomable Tree idea I posted about a little while ago primarily by going onto techie forums and presenting the sample. Based on the input I have made a few changes and some overall speed enhancements as well.
You can use the new (still IE incompatible) version here (the same place the old version used to be).
Feel free to express your opinion, suggestion, etc. in the comments or by emailing me.
If anybody knows of a good place I can host future versions for free, I would like to hear it because Google Pages is a little bit limiting.