I finally got around to writing this.

How is this different from your total post count ever hack located here ?
That one displays near the member line (registered members: 80), and totals all forums together. This one gets each individual forum count, and keeps it, so it never goes down, even after pruning. It goes up each time someone posts.

What does it look like?
It will modify the "Posts" table to look like:

Now: 5
Ever: 90

Instead of:

5

Ooooo, sounds sexy. Let me have it!
Go fetch (not feltch, ewwww).