General Debugging Topics

Algorithmic and Automatic Debugging Home Page - contains an bibliography of books and research papers, a list of tool vendors, and links to researchers in the field of debugging.
www.debuggingrules.com - page with material on David J. Agans Debugging book.
Why Programs Fail - web site of Andreas Zeller's book WHY PROGRAMS FAIL: A Guide to Systematic Debugging, with code examples and slide material.
Softpanorama Debugging Links - collection of articles and links.
Hacknot Debugging 101 - General article on debugging.

Tutorials on debugging

Automated Debugging Advanced course 2006 - class by Andreas Zeller on advanced debugging methods, with slides, and programming assignments.
Automated Debugging Lecture 2002/2003 - class by Andreas Zeller on advanced debugging methods, complete with sylabus, handouts, slides, and exercises.
Norm Matloff's Debugging Tutorial - tutorial on debugging, collection of links
Guide to Faster, Less Frustrating Debugging - contains general debugging strategies, and an introduction to using gdb.
Learn the essentials of debugging - a general article on debugging and problem solving.

GDB Documentation website. Lots of material on GDB, including the downloadable PDF version of the GDB 6.4 reference manual.
Using GNU's GDB Debugger - Tutorial on GDB, by Peter Jay Salzman.
Using GDB under GNU Emacs - special Emacs mode that combines GDB and editing source code.

Parallel debugging - lecture on tools for parallel debugging: TotalView, DDT, Marmot, Valgrind. Note that page uses RealPlayer plugin to view the presentation.

www.dumpanalysis.org - Dimitri Vostov's blog for exploring crash dumps and debugging techniques on Windows Platforms. Lots of articles, each with detailed examples, analysis, and further references.
Mike Stall's .NET Debugging Blog - Very active blog on debugging. Focus on .Net. Lots of details and examples.
greggm's WebLog - Tips and tricks, mostly around Microsoft Visual Studio
Rico Mariani's Performance Tidbits - Notes and examples on debugging performance issues. See also Rico Mariani's Articles and Recommendations - A list of articles on performance measurement, and how to design software for performance.
GNU Debugger - Swik - GDB Weblog

Here is a collection of links to Wikipedia Articles on debugging:

wikipedia.org/wiki/Debugging - page on debugging, with lists of books, and links to websites about debugging.
wikipedia.org/wiki/Debugger - page on Debuggers, with a long list (30+) of web links to debugging tools.
wikipedia.org/wiki/Gdb - page on GDB, the GNU debugger.
wikipedia.org/wiki/Performance_analysis - page on Profilers and performance analysis. Contains a list of web links to tools, articles.
wikipedia.org/wiki/Purify - page about the memory debugger Purify.
wikipedia.org/wiki/Software_testing - page on software testing.
wikipedia.org/wiki/List_of_tools_for_static_code_analysis - page with list of software tools for static code analysis.