It looks like there might be some kind of problem with the Plyr-1.4.1
packages pushed to CRAN?  The web pages show 1.4.1 as the current version,
but trying to fetch the source through the provided link gives a 404:


http://lib.stat.cmu.edu/R/CRAN/web/packages/plyr/index.html

$ wget http://lib.stat.cmu.edu/R/CRAN/src/contrib/plyr_1.4.1.tar.gz
--2011-04-11 13:19:09--
http://lib.stat.cmu.edu/R/CRAN/src/contrib/plyr_1.4.1.tar.gz
Resolving lib.stat.cmu.edu... 128.2.241.212
Connecting to lib.stat.cmu.edu|128.2.241.212|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2011-04-11 13:19:09 ERROR 404: Not Found.


This prevented me from installing ggplot2 until I went back and found an old
version (1.4) of Plyr to install manually.  Since it looks like Plyr was
*just* updated a few days ago, I'm guessing something went awry?  I checked
several CRAN mirrors and got the same problem with all of them.  They think
the current version is 1.4.1, but they don't have any files available for
download.

Hope this helps,
Ian

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