Here are some articles and classes I’ve written for MFC. This was written a long time ago and it’s probably out of date by now, but there are still a lot of people around using Visual C++ 6.0, so maybe someone will still find it useful.

An MFC PopupEdit Control
A simple MFC class that behaves like the edit control used for editing items by the ListView Control.
Handling Keystrokes on a MFC Dialog
A simple, but powerful solution to a common problem.
Enumerating ODBC Data Sources and Drivers
An MFC app, but uses only ODBC API calls.