Organic groups chat - what are my options?
I think DrupalChat might integrate with Organic Groups. According to Issue#871238 the patch in comment#2 adds this functionality.

The patch looks like it was committed to the dev branch on January 21, 2012. With the release dates of the beta11 version and the latest dev version, it looks like it might already be in those respective releases. If not, try the patch mentioned above.