I am using your plugin in the forte theme on my new blog, http://www.wwohn.com. It works fine with a rating at the bottom of each post and a list with most popular items.
However, if one item hits the roof, will it ever disapear from the rankings? I think it would be a very good addition if the ranking erodes over time.
If this would be done by adjusting the database, resetting the values would ignore the erosion. It should therefore also be included in the build up of the values.
If you choose to have wordpress re-calculate the ranking it should also take into account the age of the post or even comment. So an older post would get lower values than a newer post.