== Statistics of source URLS ==
Greedy with how many packages each hoster has in Debian, I hacked this little script to find out:

=== the hackish shell scripts ===
{{{
curl http://qa.debian.org/cgi-bin/udd-dehs?pkg= > paketliste
grep upstream-url paketliste > upstream-url
cat upstream-url |sed -e "s;.*http://;;" -e "s;.*ftp://;;" -e "s;.*https://;;"  |grep -v upstream-url |sed -e "s;/.*;;"  |sort > urls_alle
for i in ` cat urls` ; do echo -n "$i " ; grep $i urls_alle |wc -l ; done  > urls_count.csv
}}}
The solution doesn't dereference i.e. all the sourceforge aliases

=== the results ===
(Please note that some projects consist of many packages, judge yourself.)

Heres the top-list:
(and the winner is: cpan.(hands down..) )

||downloads.xiph.org||10||
||invisible-island.net||10||
||repo1.maven.org||10||
||rostlab.org||10||
||ftp.gnustep.org||11||
||gforge.inria.fr||11||
||gstreamer.freedesktop.org||11||
||ftp.ggzgamingzone.org||12||
||java.freehep.org||12||
||linux.thai.net||12||
||release.cipux.org||12||
||sunsite.unc.edu||12||
||www.coin-or.org||12||
||code.google.com||13||
||download.tuxfamily.org||13||
||ftp.novell.com||13||
||icculus.org||13||
||mirrors.kernel.org||13||
||pecl.php.net||13||
||repository.maemo.org||13||
||space.mit.edu||13||
||fcitx.googlecode.com||14||
||ftp.horde.org||14||
||prdownloads.sourceforge.net||15||
||www.enthought.com||15||
||gcc.gnu.org||16||
||archive.apache.org||17||
||0pointer.de||18||
||anonsvn.jboss.org||18||
||cheeseshop.python.org||18||
||pgfoundry.org||18||
||www.kernel.org||18||
||download.savannah.nongnu.org||19||
||ftp.kde.org||19||
||telepathy.freedesktop.org||19||
||java.net||21||
||ftp.debian.org||22||
||ftp.drupal.org||22||
||samba.org||22||
||ibiblio.org||24||
||iij.dl.sourceforge.jp||24||
||kokkinizita.linuxaudio.org||25||
||mgltools.scripps.edu||25||
||files.b9.com||26||
||forge.ocamlcore.org||29||
||fedorahosted.org||31||
||svn.codehaus.org||40||
||bitbucket.org||41||
||download.sugarlabs.org||41||
||kernel.org||41||
||sourceforge.jp||42||
||ftp.mozilla.org||44||
||download.berlios.de||46||
||registry.npmjs.org||47||
||savannah.nongnu.org||47||
||gpe.linuxtogo.org||50||
||download.savannah.gnu.org||55||
||savannah.gnu.org||57||
||download.pear.php.net||60||
||download.gnome.org||62||
||downloads.sourceforge.net||65||
||archive.xfce.org||67||
||download.gna.org||68||
||www.apache.org||73||
||svn.apache.org||85||
||www.cpan.org||90||
||launchpad.net||119||
||rubyforge.org||127||
||github.com||129||
||xorg.freedesktop.org||129||
||sourceforge.net||146||
||cran.r-project.org||152||
||ftp.gnu.org||164||
||freedesktop.org||227||
||pkg-ruby-extras.alioth.debian.org||233||
||ftp.gnome.org||242||
||githubredir.debian.net||260||
||alioth.debian.org||268||
||pypi.python.org||336||
||hackage.haskell.org||498||
||haskell.org||502||
||qa.debian.org||2265||
||search.cpan.org||2438||
||cpan.org||2536||