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The version 0.0-5 of the ant package has been released to CRAN. The package provides an R aware version of the apache ant build tool.
Orchestra has its wiki page on the R wiki: http://wiki.r-project.org/rwiki/doku.php?id=packages:r-forge:orchestra
Slides are available from this blog post: http://romainfrancois.blog.free.fr/index.php?post/2009/07/08/useR!-slides