VF Version 3.1
VF uses the Popular Tag panel on the main page.
I'm guessing it drills into the Tags table with a query/hook to the Discussions table to build a result.
Could a Random Tags Panel be built similarly, but displayed in a Tag Cloud format?
WordPress has an add-on for this purpose, I used to use one previously, but the advantage with VF is that the pre requisite 'tag' is already in place.
I have a few other ideas for it, which I'll raise later on.