I have given up on maintaining development stuff for Lily. The discussions on the mailing list give a better view of development. Moreover, by the time we get round to implementing any of the new ideas, we usually change the design anyway: as time progresses, we get wiser.
The same holds for bugs: either they are fixed immediately, or documented. Keeping around lists of things that don't work only take up a lot of time: such lists need to be maintained as well.
Hence, I only have this very short list of things here.