Discussion of: Treelets--An adaptive multi-scale basis for sparse unordered data

Discussion of "Treelets--An adaptive multi-scale basis for sparse unordered data" [arXiv:0707.0481]Comment: Published in at http://dx.doi.org/10.1214/08-AOAS137B the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org