One of the things I find ListML really handy for is planning a presentation/talk. I write up a hierarchical list of all the things I want to cover using ListML, then I can work from that list to build out my slides/demos/etc. For the recent WordCamp NYC, I needed to present 2 structured talks, so I went to work in ListML and knocked up 2 lists of things to cover. Once I was done with the talks, I realized that there was some good content in these lists that a) served as a bit of a transcript to the talks themselves, and b) in some cases wasn’t actually covered (for time reasons, or just because I forgot them).
I wanted to be able to post these lists to my site along with the presentations, but didn’t really want to post a whole separate page for each one just to put up a simple HTML list.