Yeah! It might be a little confusing for people who lurk here and don't follow the discussion into the Slack, but I think a Slack would open up some communication opportunities.
I wonder if anyone would like to try writing a Slack bot in Arc. :)
If the Arc Forum adds a link to anything, I hope it adds a link to the community-maintained Arc website (https://arclanguage.github.io/). We can add links to other resources from there.