Hi after searching in google i have zeroed down on some books for ATL COM. Please suggest the best of the lot, it can be one or more, giving me a comprehensive understanding of ATL development. I am a MFC Sr Developer new to ATL development. Inside ATL - George Shepherd and Brad King Developer's Workshop to COM and ATL 3.0 by Andrew Troelsen. ATL Internals by Rector and Sells (There is an updated version called ATL Internals: Working with ATL 8 by Christopher Et Al Tavares) Professional ATL Programming by Richard Grimes ATL Developers Guide (2nd ed) by Tom Armstrong So guys go ahead and suggest me the best from your experience. If there is any other or updated versions of the above, do suggest too.