[mindcrime]

The EEVBlog forums, probably. Some of what goes on there is just amazing. I've posted technical questions about electronics before, and in the span of a few hours had EE experts from around the world chiming in to explain $WHATEVER. I've had people give me (really old) test equipment for the cost of shipping.

I've watched ad-hoc distributed teams of people from all over the world collectively hack / reverse engineer oscilloscopes and similar gear to unlock features that were software locked to much more expensive models. I've seen people post where they hacked up interfaces to older test equipment (that didn't support modern protocols like LXI) using an Arduino or RPi. I've seen people post free hardware plans for GPS Disciplined Oscillators, reflow ovens, and FSM knows what else.

And I've laughed my ever loving arse off at some of the insane silliness is that the Test Equipment Anonymous thread. And, yes, at times I've wanted to throat-punch people for being pedantic twits, or for arguing about insane minutia that nobody else gives a fuck about, and so on. No forum / community is perfect. But the EEVBlog forum has an awful lot to offer for anybody who is into electronics.

Other than that... I guess I'd go with the old Hacker's Haven BBS from back in the day.