Hi

Just a comment on your last point:

> It also occurs to me that one of the things i'd love to have is
> well-indexed notes about any given e-mail.  So if this was adopted, i
> could presumably just write a file that has the same Message-Id as the
> message, put my notes in it, and index it.  that's a little weird,
> though.  would there be a better way to do such a thing?

A different way which might get pretty close to what you would be to
start a reply and then postpone it.

Ideally we would wrap this in a "note" function would delete the
to/cc/bcc headers to make sure it doesn't accidentally get sent and add a
+note tag when saving.

Best wishes

Mark