wow, it is remarkably difficult to find meta from earlier seasons
http://supernatural-meta.tumblr.com/etl
You could also try google… but that works better if you’re looking for something specific.
Most of the meta from earlier seasons isn’t on tumblr because tumblr didn’t exist. You’ll have to go on Livejournal to find it…
try: Heavy Meta Poisoning at spn-heavymeta.livejournal.com. People posted SPN metas there as early as 2006.
Hearseeno 