The thread is Year Zero Club
Wyndstar reportedly did an AAR on it. KzintiPatriarch did a step by step breakdown of one at the ToE site and I did a "recipe" for the 100k+ ones in our empire forums. All use different approachs, but also have related themes.
There are several ways of going about it. Most use DA and the Spore Super Ability. You put yourself in tremendous debt and spore the enemy.
I and a few others have also done it using traditional warfare. I'm not sure if I'm alone in having done one in DL though. I haven't heard of any others yet. If anyone else has, I'd imagine Mumblefratz might be the one.
In all cases, it's an all out attack, disregarding your own survival, both militarily and economically. As far as I know, all successful larger maps have been done using rare habitable planets and with the enemy in close proximity.
Most are done against a single enemy, but there have been some with up to three opponents. Neilo comes to mind there.