The whole discussion of whether gnome excludes apps without app-data will improve the quality of those listed is sort of a moot topic.
We could do with this having this sort of metadata available for all KDE apps; and in fact we already maintain this sort of data to build the pages at http://kde.org/applications/ i.e http://websvn.kde.org/trunk/www/sites/www/applications/apps/bomber.json?view=markup -> http://kde.org/applications/games/bomber/ images are all at http://kde.org/images/screenshots/APPNAME.png I fully support app developers helping keep this up to date and given we already have this information, the idea of writing a small script to convert this to the relevant XML (which to me seems a sensible spec) should be simple enough. That means we get Gnome app centre support, and if Muon want to use that spec - that'd be great too. David