Spider is available for download from CRAN, and R-Forge. Be sure to check out the spider website as well for a tutorial on the use of the package.
In the recent Barcode Bulletin published by iBoL, our humble paper announcing the R package spider: Species identity and evolution made second on their list of the top 10 publications of 2012. Not bad for a side project!
Brown SDJ, Collins RA, Boyer S, Lefort M-C, Malumbres-Olarte J, Vink CJ, Cruickshank RH. 2012. Spider: An R package for the analysis of species identity and evolution, with particular reference to DNA barcoding.Molecular Ecology Resources 12: 562–565.