Review for Docky Unread Count by Cocinero
Rated 5 out of 5 stars
lpiepiora uploaded versions 0.5 and 0.6 today. :-)
So far version 0.6 works fine for me on Ubuntu 10.04 with docky 2.1.0 bzr r1620 ppa (todays new version) and Thunderbird 3.0.6.
Click on "View all versions" to download them and give it a try. ;-)
To create your own collections, you must have a Mozilla Add-ons account.