Hi Gabor,
I agree with most of your points, and particularly about consolidating the articles in a single location; ideally there would also be an index or tags so that users could find all the articles about, say, plugins, or the use of 'appname'. I'd argue for adding it to the Dancer distribution and mirroring it on a website, rather than just having it online somewhere, mostly because it is much easier to have a single resource for documentation, and if it can be accessed offline, that's even better!
Re: the advent calendar, the advantage is that it focusses people on writing articles by a specific deadline, as well as inspiring those who would not usually contribute to write something up and share it with the community. Even if the articles are not all read in December, they provide a useful lasting resource, as the access stats you've quoted show. I think it'd be hard to motivate people to contribute for a fortnightly article -- from my own experiences of organising a monthly news email, it very quickly becomes a chore. A one-off or annual event is far more likely to be successful.
Cheers!
Amelia.