Currently, it is tremendously easy to litter a WiP project with dozens or hundreds of Tokens, Variables and Images that you won't use. Just go to the marketplace and click a few sample-projects. Whatever you click imports its assets, which remain in the project after deleting the sample-content.
I was foolish enough to do this with a project I'm working on. Cleaning up would have meant deleting one-by-one – I therefore rather migrated my good content to a fresh project. I realize that administration-tools for Tokens, Variables and Images are still basic – but the problem I described exists. Maybe it would be in order to give us a scripted cleanup tool, until you have a GUI-implementation?
