I write katalog for fun, because I need such an application and to learn KDE internals, so some periodic rewrite is normal.

0.1 - The first release of katalog, an ambitiuos start: new file type, new UI, integrated search dialog, category support.

0.1.1 - The never seen release, it includes some bug fix and a couple of traslations. A change in my life (work and city)
        caused an undefined delay in the release.

0.2 - The second release and the first rewrite, more ambitiuos than before trying to reproduce all the functionality
      of the 0.1 in an application fully integrated in Konqueror and KDE. It looses some feature: category support, it breaks
      compatibility with the previous file format but it gains integrations, performance and stability. Now it's a modular
      application including a library, a kioslave, a service menu.

0.3 - The third release and the second rewrite, the file format is more rich but the old type is supported, metainfos are included
      in the *.katalog file, dcop interface is the keyword of this release. Now katalog is a library, a dcop server, three dcop
      clients (kfile plugin, service menu, kioslave).

0.4-preview - The main change of this release is migration from an XML file format to a database (Currently I have tested only SQLite3 but nothing stops from using any other DB that Qt supports). Old file format is supported, currently only reading (just click on your old files to navigate it) but import/export function are work in progress.
The navigation of catalogs is greatly simplified: now you can find a katalog folder in Konqueror sidebar in the services tab, from there you can find all catalogs and an experimental navigation through mimetypes.
Last but not least the catalog creation widget now shows a progress indicator with the possibility to stop current jobs.
Note: since this new version installs several configuration files for konqueror you my need to kill each running instance of it to enable all functionalities, you can achieve this with a logoff/login procedure.