I Would like to nominate the below articles

How Virtual Table and _vptr works
http://www.go4expert.com/showthread.php?t=16544

Virtual Friend Function
http://www.go4expert.com/showthread.php?t=16397

Handle-Body Design Pattern and it's uses
http://www.go4expert.com/showthread.php?t=16405

Smart Pointer with Reference Counting
http://www.go4expert.com/showthread.php?t=16448

Prefer Function Objects over Function Pointers
http://www.go4expert.com/showthread.php?t=16504

Virtual Table and _vptr in Multiple Inheritance
http://www.go4expert.com/showthread.php?t=16616

Size Of a C++ class Object
http://www.go4expert.com/showthread.php?t=16676

Many thanks
Mridula