Shortcut to predefined links in side-menu, possible?

I want to add some links that is showing all folders with specific tag in the sidebar (or any other place). Somthing like:
Is it possible?
If not, some kind of tag cloud?

There is the app External for links to external sites. But i think that does not work with your links because they transfer data trough POST- and not only GET-parameter. But you can test it for some internal links.