AutoBlog Doorway Pages - Do They Work?

Has anyone tried to make an autoblog that uses doorway pages?

Theoretically, Google could easily catch it. Just use an IP or change the Agent into something legit. But are there rules that say Google can't do it?

Oh, I'll send anyone my script if they can give me a good definitive answer on this.

but Google can't process JS or FLASH AS, and also it is not an easy task to define what doorway is ...
in fact I am thinking to start doorwaying again, but if you do infinite number of dynamically generated door pages then google will ban you.
Google banned me for that couple of times.
I was able to get traffic from very very low frequency keywords.
doorway is a good thing... in general