A quick update to my previous posting about collect.kde.org during the Berlin Desktop summit is in order for two reasons.
First, collect.kde.org is now a fully functional battle station .. er .. Synchrotron installation. Things that are added to the shared sources repository will automatically appear there. As an application (or application add-on) developer, you can quickly and easily set up your own provider and start populating it with items. It takes all of about 2 minutes to set it up. How to do this is documented in the Quick Start section of the README.
So If your app has data that you wish to control the updates to (as opposed to user-contributed and -curated content, which is better done through opendesktop.org), you may wish to consider using collect.kde.org.
I'm collecting questions developers have as they start using collect.kde.org and will be writing a Techbase page in the future that provides a clear tutorial that covers both the basics and these questions. Don't let the lack of that tutorial stop you though, check out the README and get started.