So, while poking around the repository today, I noticed that version 0.49 of AtD was added four days ago (08Dec09).
Strangely, although I have version 0.421 installed, I am not notified of a new version.
When I use "Add New Plugin" feature from within WordPress, and serach for AtD, clicking the Install button in the search results opens the AtD repository page in the lightbox window. However, where the Install/Upgrade button normally is, the following message is displayed:
Newer Version (0.421) Installed
This makes no sense.
Is this an issue with AtD, or with the updater/update-checker?