Hello,
If you are interested or use the gem clusterer or any of the plugins acts_as_classifiable, acts_as_clusterable you may want to check out the release candidate for rel 0.2.0, take a look at
http://cuttingtheredtape.blogspot.com/2007/03/clusterer-other-plugins.html
Cheers,
Surendra Singhi Kreeti Technologies http://www.kreeti.com/about/about