How about a Trending Threads link next to Watched Threads in the Forums menu?
It would open a paginated list of the trending topics.
How about a Trending Threads sidebar block? Shows the top n trending topics and links through to the trending topics page?
What's a trending topic? So how do we define the popularity of threads?
I suggest it has to be a calculation based on the number of views and/or the number of replies divided by the age of the thread. There are probably some people on Xenforo who already have a tried and trusted method of deciding this.
So I'm looking for quotes for a trending topics system, please. Specification to be decided here with input from other members with the intention to freely release or sell the addon depending upon its cost to us.