How to install the latest version of PGF/TikZ?

 mkdir /usr/local/texlive/2009/texmf/tex/generic/pgf-2.00-cvs
 cd /usr/local/texlive/2009/texmf/tex/generic/pgf-2.00-cvs
 curl --proxy proxy.unibe.ch:80 $URL -o pgf.zip
 unzip pgf.zip
 rm pgf.zip
 mktexlsr