The idea is to have it organized in repositories. The graphical tool qt-pods (there will be a command line version in the future) loads a list from your defined sources, then offers packages for install. You just click on them and they install to your projects. The same way you remove them.
What happens is that they get added as git submodules and are woven together via a single .pri that is the single thing you need to include to you project. Then you can start using them! It's very easy, but it needs more people to come together, reformat the code and spread the word.