Consider: with the plugin site for vBulletin, vbulletin.org, you are notified of updates for plugins, or see an "Updated" label next to the thread containing information about that folder.
Are there plans to perform a similar move for your add-ons? At the very least, add-on developers could put the date of the last release in the thread title, so you can scan for new versions quickly.
How is this being addressed? If you have a dozen or two add-ons, it can be time consuming to have to regularly check for possible updates, particularly when the core software gets an upgrade.