I keep a GC folder in my Favorites full of links to articles and blog posts about the .NET GC.  I thought it would be a good idea to consolidate them all into one blog post, for handy reference.  These are the articles I most often post as answers to questions on public newsgroups.
 
If you know of any other good ones, please post them in the comments!  If you find some totally erroneous articles, point them out too.

GC Overview and Best Practices:
 
http://msdn.microsoft.com/msdnmag/issues/1100/gci/
http://msdn.microsoft.com/msdnmag/issues/1200/GCI2/default.aspx
Garbage Collection (parts 1 & 2): Automatic Memory Management in the Microsoft .NET Framework
Jeffrey Richter

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconfinalizedispose.asp
Implementing Finalize and Dispose to Clean Up Unmanaged Resources
.NET Framework General Reference

http://blogs.msdn.com/cbrumme/archive/2004/02/20/77460.aspx
Finalization
Chris Brumme

http://blogs.msdn.com/cbrumme/archive/2003/04/15/51319.aspx
Turning off the garbage collector
Chris Brumme

Performance:
 
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/dotnetGCbasics.asp
Garbage Collector Basics and Performance Hints
Rico Mariani

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag/html/scalenetchapt05.asp
Improving .NET Application Performance and Scalability: Chapter 5 — Improving Managed Code Performance
J.D. Meier, Srinath Vasireddy, Ashish Babbar, Rico Mariani, and Alex Mackman

http://weblogs.asp.net/ricom/archive/2003/12/04/41281.aspx
Mid-life crisis
Rico Mariani

http://weblogs.asp.net/ricom/archive/2003/12/02/40780.aspx
Two things to avoid for better memory usage
Rico Mariani

http://blogs.msdn.com/maoni/archive/2004/06/15/156626.aspx
http://blogs.msdn.com/maoni/archive/2004/09/25/234273.aspx
Using GC Efficiently - Parts 1 & 2
Maoni Stephens

Edit: Added link to Maoni's GC posts.