I am right now in the last half of the last day of a course on C++ Internals conducted by Collosal Learning’s Mubarak.
The workshop is really interesting; a must attend for anyone interested in becoming a really good C++ developer. The “internals” knowledge of C++ is something you would gather if you have worked on C++ for a long time. Attending this course will help you to assembly your learning better and also pick up some new tricks. Apparently they will have another session in May 2009. If you are even remotely interested in making your C++ skills razor sharp; you must attend this course. At 8000 bucks for 2 days, this one is complete value for money.