Review for ThreadKey by StefanLasiewski
Rated 4 out of 5 stars
I gate this plugin another try.
And, after some RTFM I see there there is a special build intended for MacOSX users available at http://threadkey.mozdev.org/drupal/content/threadkey
The fix uses 'Cmd+T' & 'Cmd+U' for Threading/Unthreading threads.
Now it works great, except I need to disable the automatic updates for this plugin ;)
To create your own collections, you must have a Mozilla Add-ons account.