There's been quite a bit of talk about partitioning channels. And the #lesswrong sidechannels sort of handle it. But it's nowhere near as good. I'm starting to have ideas for a Slack-style interface in a terminal... but that would be a large project I don't have time for.
I haven't tried it, but this looks like it could be useful for that project: https://github.com/evanyeung/terminal-slack
This is a short post to say that I have started and am managing a Slack channel for lesswrong.
Slack has only an email-invite option which means that I need an email address for anyone who wants to join. Send me a PM with your email address if you are interested in joining.
There is a web interface and a mobile app that is better than google hangouts.
If you are interested in joining; consider this one requirement:
To be clear; This means (including but not limited to);
Edit - first week of October: http://lesswrong.com/r/discussion/lw/mub/open_thread_oct_5_oct_11_2015/csr3
Edit - 3rd week in october 2015: http://lesswrong.com/r/discussion/lw/mwt/open_thread_oct_26_nov_01_2015/cuq5
Edit - 3rd week in november 2015 http://lesswrong.com/r/discussion/lw/mzz/open_thread_nov_23_nov_29_2015/cwyl