Besides slinkset, if you have the time and need the control, why not hack at HN [1] or reddit [2]?

Honestly, the best discussions online are still on mailing lists. I need more time to think about why that is, and how we can designed that into the newer stuff. But I can't get into that now.

[1] http://arclanguage.org/install (Hacker News engine included)

[2] http://code.reddit.com/