Raul Valdes-Perez, the CEO of Vivisimo (the company that brings us Clusty) has written a column for News.com about how the "best" search personalization is done by the individual. Here's our introduction to Clusty.
I've also found that dynamic clustering can be a useful knowledge discovery tool often finding themes, concepts, etc. that would be difficult to see without the clustering.
The Valdes-Perez column: Narrowing the search, also discusses some clustering/interface research being done at the University of Maryland.
Meet Your Favorite Search Engine Watch Contributors
Many of SEW's leading expert contributors will be at ClickZ Live, the new online and digital marketing event kicking off in New York (March 31-April 3). Hear from the likes of: Thom Craver, Josh Braaten, Lisa Barone, Simon Heseltine, Josh McCoy, Lisa Raehsler, Greg Jarboe, Dan Cristo, Joseph Kerschbaum, John Gagnon, Eric Enge and more!