O pacote 'descr' ainda está disponível e instalou normalmente no R 3.0.0. O que eu pude ver, no entanto, é que a maior parte dos comandos que ele oferece podem ser facilmente substituídos por outros de uso mais comum.
Documentation for package ‘descr’ version 1.0.1
DESCRIPTION file.
Package NEWS.
Help Pages
compmeans Means of a numerical vector according to a factor
crosstab Cross tabulation with mosaic plot
CrossTable Cross tabulation with tests for factor independence
descrSummary of an object
file.head Prints first lines of a file.
forODFTable Convert an object of class CrossTable into a matrix for odfTable
freq Frequency table
fromUTF8 Conversion from UTF-8 encoding
fwf2csv Fast conversion of a fwf file into a csv one
histkdnc Histogram with kernel density and normal curve
LogRegR2 Pseudo R� of logistic regression
plot.CrossTable Mosaic plot from object of class CrossTable
plot.freqtable Bar plot from object of class freqtable
toUTF8 Conversion to UTF-8 encoding
xtable.CrossTable CrossTable method for xtable