According to Brian Moon's blog today, the popular PHP forum package Phorum has hit the 10 year mark in its development:

So, I am at the MySQL Conference this week with my Phorum co-developers. We got to talking last night about how old Phorum is. We knew it was about 10 years. We pulled up some old archived zip file of version 1.5 and found in the this in the comment block. "* Created 04/16/1998" Whoa! That means that yesterday was the 10th birthday of the Phorum project.

The current version of Phorum is 5.2 stable and can be downloaded directly from their site.

Development of PHP scripts without a preconceived plan to manage them is asking for a headache. The goal of a framework is to make the process of writing web-based applications simpler.

An application designed around MVC is easier to manage because it is split into tiers, which allow for independent development. This promotes code reusability by building models, which are reusable throughout the application.

His list includes frameworks like Phrame, Symfony, and CakePHP ranked according to his personal tastes. He does provide some backing behind his top three choices, however - giving his reason(s) for picking them.