I came across this presentation from Tamara Munzner. A great read about some of her latest research in visualization. Here are the tools the presentation references. They are really interesting and if you look around on Tamara's Web page, you will find some videos and the tools themselves.
- Accordion Drawing: Tree Juxtaposer and Sequence Juxtaposer (olduvai.sourceforge.net)
- LiveRAC to monitor time-series data (alarms and metrics)
- SessionViewer for log analysis (well, really Web session analysis)
- Glimer, something about multidimensional reductions. Don't ask me how this exactly works
- Grouse, interactive hierarchy exploration
- TopoLayout, Multi-Level Graph Layout by Topological Features
- and some more specialized tools