Last modified: 2009-04-23 23:10:27 UTC
Title is self-explanatory. Possible difficulties is we need to expose a "secret URL" since many 3rd-party feed readers can't do normal authentication and then pass on cookies. Expiration of this URL is entirely up in the air; generally speaking, it shouldn't expire unless the user asks it to (ala Google Calendar's ics link).
*** This bug has been marked as a duplicate of bug 471 ***