Om Malik writes on the emerging micro-publications:
Micro-pubs have a narrow and extreme focus on one niche category
Micro-pub editor/founder is an expert in his chosen arena
Micro-pubs use open source tools and a content management system like Moveable Type or pMachine.
Micro-pubs all command very high CPM rates because of their narrow focus.
Micro-pubs are more than just a blog, I.e. they have a mix of links and original reporting.
Micro-pubs only work with a skeletal crew – add more people and the business model of these micro-pubs breaks down.
In short, micro-pub is a combination of old fashioned newsletter, blog and a directory service, managed by one to ten people.