Not my work at all but its awesome and a more than a bit applicable to 1e and 3e. Its 2012+ covers pages of community (RPG.net) commentary on the Monstrous manual with ideas, discussion, plot seed and more.
It can be had here on mediafire .
The consolidation thread is here on Big Purple and it includes the 5 original threads as well.
The authors blog Monsters and Manuals is also recommended.
lastly one of the commentariat , Demiurge 1138 is a nano-publisher like me. You can get his stuff on Paizo under Demiurge Press. Note also the 1st item there is free so no reason not give it a try. I am heading over there myself.
The Return of Planescape? - Curious. There is a brief note on this 'countdown' at Enworld.
15 hours ago