The Private Flying Forum
Due to my varied flying career I pop in and out of several forums (sorry, not clever enough to know whether the plural should be fora or forens or whatever) and I have to say that by far the livliest and most interesting and informative one is right here.
There have been several threads of late that have descended into bickering rather than banter; and many discussions over what should and should not be on this forum (or even whether this forum should exist); but for sheer entertainment, and for the amount of accumulated knowledge available here, I think this is a great forum.
Whether you want to know why you constantly get the same thing wrong, want to learn from other's mistakes (thanks Thief13) or just want a good laugh or a good rant, then you won't find a better place.
No real point really, other than to say, it's great.