Some Linux software sources

yum for Fedora & Red Hat
yast for SuSE
apt-get for Ubuntu
Source management tools can drastically make the software installment and update convenient.
Of course,the precondition is that you have already got some fast souce-sites as follows:
http://www.freshmeat.net
http://freshrpms.net
http://livna.org
(Find some sources in these websites by yourself)
Besides these,there are:
http://linux.tucows.com
http://www.fokus.gmd.de/linux
http://www.LinuxISO.org
For domestic campus network,University of Science and Technology of China is a good one.The net speed is fastest among all the universities in China.Besides this,Shanghai Jiaotong University and Tsinghua University are also OK.
As for public network domestically,I'm not sure.