Absolutely agreed. Bogleheads is an absolute treasure of discussion and I've gotten some excellent tax planning advice there. It's one of the few sites in my reading rotation with HN.

MMM's forum is also a classic. I don't read it regularly these days, but it definitely gets a read once every month or so. Still surprisingly active and I've found some really good lifestyle financial advice there, as opposed to the more number based info I get from Bogleheads. I just enjoy the idea of a forum filled with Mustachian ideology.