This post on using weblogs as a personal organizing tool is a rare example of the "Gee, aren't blogs swell?!" genre of weblog posts that actually manages to touch the elusive certain something that makes blogs work. What's nice here is the resonance between personal needs and knowledge management value. The fact that the blog is public tends to force the user to annotate with more detail. I can't tell you how many times I have written down or bookmarked a URL only to forget why I marked it. Both the act and the fact of annotation help me remember why I cared about the web page (or, as KM-heads would put it, the "context").
Software developers, take...er...note. Add the blogger API to something like Circus Ponies Notebook and you'll have something truly useful.