For [@Account] discussions you can always go to http://twitter.com/[account] to see what it was but as far as I know there is not yet a script where Twitter will post those micro-conversations.

But that is an interesting option or service to consider. Allow people to specify to include the tweet of the recipient of one of your @ replies if it includes you as a recipient as well. The problem is, many folks are responding to non directed tweets and unless Twitter clients are feeding back tweet UIDs to the server when someone uses a "reply" function rather when something is typed in manually, I'm not sure that is possible.