Every programmer using ATL and WTL knows that ATL Internals is a must-read book providing comprehensive background information about ATL.
ATL is my favourite library to use as a base for Windows development. It helps to solve wide variety of problems, on both sides: client and server, especially strongly simplifies creation of COM components. ATL-based binaries are very small and robust. ATL is also an underlaying layer for WTL which is a GUI toolkit, light-weight and modern alternative to MFC.
