People

Richard Stallman [stallman.org] -
Eric S. Raymond [tuxedo.org] -
Larry Wall [wall.org]

Linux Programming

Linux Programming Resources [leapster.org] -
Kernel Traffic [zork.net]

Unix

Unix Review [unixreview.com] -
Sys Admin [samag.com] -
Art of Unix Programming [tuxedo.org]

Programming Methodologies

Extreme Programming [extremeprogramming.org]

C Programming

Programming in C [cf.ac.uk] -
Standard C [ucsd.edu] -
C Library Reference [uiuc.edu] -
GNU C Library [gnu.org]

C++ Programming

David Beech's Introduction to C++ [codelearn.com] -
C++ for C Programmers [4p8.com]

Perl Programming

Perl Doc [perldoc.com] -
Perl Monks [perlmonks.org] -
Perl.com [perl.com] -
VMS Perl [sidhe.org] -
Use Perl [perl.org]

Network Programming

Beej's Guide to Network Programming [csuchico.edu]

Open Source

Open Projects [openprojects.net] -
Sourceforge [sourceforge.net] -
Slashcode [slashcode.com] -
The Cathedral and the Bazaar [tuxedo.org]

Windows Programming
http://msdn.microsoft.com/ [microsoft.com].
http://www.codeproject.com/ [codeproject.com]
http://www.codeguru.com/ [codeguru.com]

You can get generally pretty sound book reviews for thousands of books on these and related subjects at the Association of C and C++ Users web site [accu.org].
Herb Sutter's web site[www.gotw.ca] has lots of informative and thought-provoking C++ articles by one of the guys who's advanced C++ programming technique a lot in recent years.
Similarly, Scott Meyers' publications page [aristeia.com] has many worth-reading articles on C++.