Useful Sites and Links (Compilers, Tutorials, API Documentation, Code Repositories)

Tutorials
Cplusplus.com - A fantastic site with comprehensive C and C++ documentation, as well as tutorials
Tutorial on Pointers and Arrays in C
MS
theForger's Win32 Tutorial
Linux
YoLinux.com - A collection of tutorials for everything Linux (specifically linked is the C++ Development section)

APIs
MS
The Microsoft Developer Network (MSDN)
Linux
Codase.com
GTK.org
Apache C++ API

Code Repositories
Sourceforge.net - Code and project repository
Freshmeat.net - Code and project repository

Compilers/IDEs
GCC
Visual Studio 2005
Eclipse - This may take some configuration to be able to use to compile C/C++ code.
The Bloodshed Dev-C++ Compiler