I spent half and hour by searching how to use blogger service within my own website which is powered by Google Apps. How I went through all forums topics, It seemed that Google Apps is not supposed to work and allowed blogger.com to use. Ok, I created new blog on blogger site and write first article. But I haven't give it up and have tried to search again this evening. So I have been surprised that solution is so simple. Sometimes reading of manual is worth, see How do I use a custom domain on my blog?