I sent this as an email to Dave Winer but I'm posting it here so he has somewhere to point:
This is just a shell of an idea hardly worth blogging, but if you're getting into the comment spam issue it is worth sharing. tcp.im could be used to IM a managing editor of a Manila site when something is posted so they can take swift action. For a relatively low-flow site, one could even require all comments to be approved, and not unduly hamper flow.... at least while a managing editor is online.
There are obvious issues but its an idea worth tossing around, I think.