That looks really impressive. I'll definitely have to give it a try.

Here's hoping the source is decent to read, too, Graphviz is a nightmare and I've been curious how to do some of these things.

This is great. I've found myself needing a nice canvas-based graph visualization tool; I might just look to their code (thank goodness for LGPL!) for inspiration. When I start the project up and it gets a bit of velocity behind it, I'll post the github link.

While Tulip is significantly more capable, have you seen Canviz before? It's graphviz rendered on a canvas.

http://code.google.com/p/canviz/

Very interesting; I'm much more interested in building graphs similar to this (and animate them), albeit in 2D, though: http://tulip.labri.fr/TulipDrupal/sites/default/files/upload...

I've seen desktop-code that does that, but nothing in JS so far.

One site I've found has been particularly full of quality material, including lots of open source projects: http://www.dmoz.org/Science/Math/Combinatorics/Software/Grap...

I've used this a lot, probably the only tool to visualize large graphs without just coding something yourself.