Good ATL Resource

Hi,

I'm programming with c++ for like 2 years now. did a lot of things with it and i think i know the language very well now. just the language ( did those tests on the site and got a average score of something like 90 % )

I've programmed for .NET to, i am a class designed in my current company. Now i want to start learning ATL however i cant find any well resources on the internet. i rather dont want to pay but if there is that really good resource.... well lets just say that i can make exceptions ;)

anyway, my question is if anyone of you know a good resource on ATL. i dont have to be the expert in ATL, but i want to have knowledge about writing com object in ATL.

thanks for helping already,

- Koen