That was the first computer forum I joined, back in 2004. I still post there but mostly talk to a few friends outside the forum. It was one of the top forums back in the days of old-school watercooling, but activity has declined a lot. I think the mods had a lot to do with it. One of the strictest forums out there, lots of censorship, infraction system, 1-day bans, forum restrictions, far too many sub-forums that overlapped, etc.
I need to join OCN. I can't even count the number of threads I've read through on that site, just from googling.