I've had the idea for a while of using a wiki as a place where people could list diachronic changes they've run across -- especially interesting or non-intuitive ones, but even obvious ones would be cool, since what's obvious to one person might not be to another. I have come across a lot of interesting changes, but never had any centralized place to note them, and I figure a collaborative repository for such information would be even better than a personal one. I am interested in pretty much any sort of diachronic change -- phonological, lexical, semantic, morphological, syntactic, you name it. (I suppose dialect variation might work into this somewhere too, but it might complicate things.) Ideally, all entries would cite sources, although as far as conlanging is concerned I'd rather read about an interesting change without a source than not read about it at all. What does everyone think of this idea? If it were to go forward, would it be possible to use existing conlang wikis? What are some potential problems?