The current version was put together quickly for the IGES meeting of October 2005 and is not really ready for public consumption, but you may look at our poorly-documented, pre-alpha code here in a few days. The current code was written entirely in the Octave language, but we plan to port future versions to the R language.
Mike Miller and Na (Michael) Li presented a poster at IGES 2005 in Park City, Utah. Here is a copy of their poster in either PDF (two pages with figure on second page) or PowerPoint.
Please send comments, feature requests, etc. to Mike Miller at mbmiller@taxa.epi.umn.edu