A possible re-ordering of the site could allow for easy routes to posts on a particular topic, be they old or new. Something like tagging system, but more clear-cut, so whenever someone adds a new post, it goes straight into a particular section. Also, the post could be regenerated every time the discussion extended to more than 300 comments, to keep things fresh (keeping the old comments in an easily accessible archive).
A possible re-ordering of the site could allow for easy routes to posts on a particular topic, be they old or new. Something like tagging system, but more clear-cut, so whenever someone adds a new post, it goes straight into a particular section. Also, the post could be regenerated every time the discussion extended to more than 300 comments, to keep things fresh (keeping the old comments in an easily accessible archive).