you know, I've seen six or eight different web sites in the past few weeks who've updated their RSS and/or XML feeds, but NONE of them managed to mention it anywhere, as far as I can tell. Certainly not within the feeds that they were retiring! Which means that I missed maybe a month or so of updates because they weren't showing up in my feed readers. The old ones weren't turned off; they just became static.
Bad practice, people!
New Rule: Subscribe to your own RSS feed, so you can see if/when it encounters any problems. Because, unlike your web site, people using feed readers don't come back to your home page to check up repeatedly and they could easily just drop the feed instead of actively trying to seek out to see if a new one has been created.