-
http://distrowatch.com
a very popular site with release news and reviews -
http://www.archlinux.org
Arch Linux -
http://frugalware.org
Frugalware Linux -
http://www.slackware.com
Slackware Linux -
http://www.ubuntulinux.org
Ubuntu Linux -
http://freshmeat.net
if you look for some software it is a good site to start... -
TeXmacs
a wysiwyg free scientific text editor and
interface for computer algebra systems -
Kile
a user friendly TeX/LaTeX editor