Well, I'd follow your blog, for one. But http://planet.squeak.org/ is pretty darn cool: start your own blog, and have the planet aggregate it.
I'd better use our own tool, a kind of mix between blog and wiki... using rights to allow some other people to modify/complete some posts... I think we have it already minus some particularities, it's more a question of organization.
One thing I'll find important is to define a common set of tags (topics, level of completion, importance, documentation type, deprecation (st version concerned) etc...).
Voting on relevance cound be nice too...
Having proper developper/person profile would be of high interest to me too... so that a beginner can find post written by beginner, tutorial for beginners, etc... If you "like" someone, you can get his posts/modifs/comments plus the ones of people that are "similar" to him...
...
Just my 2 cents ;)
Or there's Yahoo! Pipes, described by Bill Clementson here: http://bc.tech.coop/blog/081206.html
The concept's the same, at any rate: instead of a single community blog, there's a single blog aggregator, fed by multiple personal blogs.
frank