Blogoforum - Frontpage views

I'm thinking about what to show on the frontpage of Blogoforum. A list of recent discussion like currently present is a must of course. And so is the tagcloud. There are different tagclouds to consider, however. I can think of two:

1. A "what's being talked about now" tagcloud with popular tags in the past x days.
2. A more general "what's being talked about" with all-time tag popularity. Although this is probably less useful.

Then what also would be interesting is a list of "hot" topics, topics that got the most hits or most replies, or the most replies in a short period of time.

I think some sort of digg/reddit-like voting system is necessary too. But you already looked into that I saw somewhere. This rating also should be taking into account with the "what's hot" topic list.