Passionate users make a popular blog
In general, a popular blog might distill and aggregate content for readers; point them to the pertinent information with accompanying commentary. Oh, and it might be written well.
In particular, the CPU blog spans an important and always timely interface, discussing the interaction of people with technology. Any developer designing a new system should take a moment to peruse this site for new ideas and as a reminder to make sure they keep the end users in mind. Any user should peruse this site, to know what to ask the developers for. It's cool how the posts delve into human psychology with technological aspects in a supporting role.
A popular blog might play the role of boundary object between different networks. See Ambient Findability by Peter Morville, p 119, and Knowledge-at-work, and others. The Knowledge-at-work post, hits it, I think: "boundary objects serve as point of mediation and negotiation around intent"
Entry filed under: feed my pet brain.