If you want an idea of what the Instant Outliner is, check out this excellent survey by Hutch Carpenter.
Very quietly, and I mean very quietly I've been working on rounding out the features of the latest OPML Editor-based implementation of Instant Outlining. This one is a keeper, I think -- more so than the previous releases.
There's now a follow-unfollow paradigm, so not everyone is hooked in by default with everyone else. It works like RSS. The person being followed is not aware who is following, and does not have to give permission. However the updates are restricted to a single server.
The server is also part of the implementation. You can't get the client software without getting a server. However the server is disabled by default. The point is that is should be very easy to set up another instance.
Next week I'm going to Seattle to hang out with my old programming partner, Brent Simmons, and his lovely wife Sheila. We're going to get me booted up on kernel development. It's been way too long since I've gotten in there and been able to fix bugs and add new features. Funny how time flies when you're having fun.