Wikipeda Does RSS
I amazed this hasn't been done before: you can now track changes to Wikipedia articles through an RSS feed. If you use Firefox, say, to go to the history tab of the page that interests you, you'll find the standard orange radio symbol in the address bar like any other RSS feed.
This is clearly great, because it means that you can watch how pages of interest to you change; it's also clearly terrible, because it means that edit war loonies will be able to engage even more rapidly. (Via Micro Persuasion.)