I got turned on to BITOG about two years ago. They got a blurb in Hot Rod magazine recently.
If you go there and your first question is "What oil should I use?", that's like asking about shocks here and the grizzled vets will deservedly smack you upside the head and tell you to use the Search.
BITOG gets way, WAY more in depth that what oil "looks right" or "feels good". These are people who analyze the MSDS for oils and will send both used and new oil to a lab for analysis.
They also have forums for other stuff like boat, small engine, gun oils, tires, detailing, etc.
If you hang out there for a while though, you can learn a lot.