Updating Blog Posts

Here's features I would like for my blog:

1. A way for commenters to be emailed future comments on a thread. Volokh Conspiracy has that.

2. A way to make sure that a particular post is "sticky" and stays as the first or the second or the n'th post appearing. VC has something like that too.

3. A way for any post that I update to move from whatever date location it is in to the top of the list, with a note as to its original and new date.