I'm also here via princessofgeeks, totally interested in this discussion! I was kind of tumblr-resistant for a while, and then finally gave in and after a bit of finagling have found a place where it mostly works for me. I cosplay, so the visual nature of tumblr is great for sharing progress photos paired with quick write-ups - I've set up something to do DW crossposts when I want to, though the mechanism (via RSS) means the formatting on DW isn't great. I think I'd like to set up a crossposter from the other direction, too, to capture some of my fannish commentary. Most of my problems with tumblr are culture problems, rather than technical problems, though some of that is because I'm pretty zen about the fact that as I give tumblr no money, I'm not actually the audience they're courting (which is another thing tumblr uses don't seem to grasp - funding through advertising means the end user is not actually the priority).

I think I'm kind of an outlier in that I actually use a different platform (Plurk) for livewatch commentary/personal griping - it's sort of like Twitter, except replies to a post are gathered under that post. This is what the interface looks like. You can also mute plurks so you don't get notified of new replies to them, which solves my main problem with Twitter (hard to control the input volume). The platform is not the most stable, but it's fairly easy to lock down and I think more importantly, it's really easy to post - with DW, you still have to click through a lot of pages, which is fine for a longer one-off, but I think would get kind of tedious for a pile of short posts. Though now I'm wondering if we could make a 'quick post' module or something, much like we have 'quick reply' (and when DW added the ability to do that from your reading list, without having to go to a new page? WONDERFUL).