The Function Pointer Tutorials - Introduction to C and C++ function pointers, callbacks and functors by Lars Haendel. - http://www.newty.de/fpt/
C++ Callback Solution - A solution to the problem of passing class methods as Callbacks in the C++ language using a template pattern. - http://www.partow.net/programming/templatecallback/index.html
myelin: Implementing delegates in C++ - An implementation of .NET delegates with C# syntax in straight C++ using a preprocessor. - http://www.myelin.co.nz/notes/callbacks/cpp-delegates.html
Callbacks in C++ - Information on implementing callbacks in C++, a free callback library, and sourcecode. - http://members.chello.be/sf15772/programming/callback/
Callbacks in C++: The OO Way - By Jurgen Hermann. What are Callbacks? A simple Thread class. Thread implementation. A real Thread class. - http://www.etsimo.uniovi.es/cscene/topics/misc/cs7-04.xml.html
Callbacks in C++ Using Template Functors - A detailed paper by Rich Hickey on the concept of callbacks and the usage of template functors to realize them. - http://www.tutok.sk/fastgl/callback.html
Callbacks - A short page about callbacks and functors. - http://mccammon.ucsd.edu/~oompaa/Oompaa/oompaa/global/doc/callback.html
Using Member Function Pointers - A detailed article from the borland community. - http://www.vmlinux.org/jakov/community.borland.com/15837.html