Perma your RSS!
This is really just to air a pet peeve of mine as it's happened a couple times recently (Molly.com for example). We web developers talk of permanent links for our HTML pages and talk of setting up redirects for pages that actually move but what about RSS feeds? What do you do when you decide to move where your feeds are located?
Keep the old RSS feed in the same place but only give it one entry. This entry should include information on where to find the new feed. If I open the old feed in Bloglines or some other aggregator, I'll be able to find the correct URL.