I suppose I have a PKM system, but I think it looks very different from this. I would include things like my photos and video clips and audio recordings, which are certainly as important to me as blog posts and essays. I depend partially on search when I intend to use content, but also largely on memory, to know that I once wrote about a thing (and conversely, I write about such things in order to help me remember them). My retrieval process is therefore pretty chaotic, involving my own website, Google, Flickr, Creative Commons, and a bunch of other services. In a similar manner, I rarely do 'planned' writing, but rather, write in response to something I see, or occasionally, on request. This means there is a decision point in my process, 'respond to this?', and then a set of possibilities, including comments (though I am trying to get all of this to route back to the same place (so far unsuccessfully, which is why I originally proposed mIDm)).