OK. I knew I couldn't manage to keep myself away from enterprise architecture for long.
I must admit that is a topic that seems to me not so much connected to the real life in the IT.
In any case one of the big problems is that there are no nice tools to help you getting started and to do a good job, especially in the OSS world.
I found the Essential project and I'll give it a try, it has also good tutorials to manage to have a more real grip to something near the stuff one has to manage everyday.