I remember, before the revolution when I was still red, I found I was the one who attached many if not most of the Announcements and Editorials to the contest pages. It was one of the features (along with coach mode) I discovered after achieving red, and I did it consistently because it was useful for not only me but others. I know when I go back to contests I always look at the announcement and editorial to see if there's anything more to learn (from the post or comments).
The main point is — currently this isn't getting done sometimes, and when it is, it can be many days or weeks later.
As a couple examples:
http://codeforces.net/contest/611 has neither and I have to go to Errichto's page to find them.
http://codeforces.net/contest/605 and http://codeforces.net/contest/607 only have one of the two.
No longer true, yay! Hope this keeps up :)
Anyway, I think it would be great to have red coders who will attach the announcements and tutorials, and possibly extending the permission to orange or lower would also be a good idea.
(also, I'm not entirely sure that this is for red users anymore, but this 4 year old blog post seems to suggest so: http://codeforces.net/blog/entry/4619)
Thanks!