David Weinberger's comments in the klogs list resonate with me:

"...with web-based doc mgt, it feels like you're publishing your stuff, not putting it behind 6 inches of rolled steel.

This, IMO, is perhaps the key reason why a KM system that incorporates weblogs can succeed. We write weblogs not simply to do good for the organization but because we are social creatures who like being listened to. We like being in public. We like being appreciated. We like being famous. People (in general!) will only write weblogs if they get personal satisfaction from training a small spotlight on themselves. And that, btw, is why KM weblogs will only work if they are allowed to wander off topic, make jokes, get sassy, publish personal ideas and opinions, and occasionally curse out dumbass managers."

One of these days I'm going to read the the cluetrain manifesto book.