Depends on what facet of the audio industry you're talking about. I'm mostly on the recording side of things. Here are some good references for that end of the industry. (For some reason I can't post URLs, so these are the best I can do):
soundonsound dot com
The general go-to for all things recording. Lots of knowledge to be gleaned from the archives.
recordinghacks dot com
I mostly use this for the microphone database, but there's lots of other info to be had.
quietplanet dot com
Gordon Hempton's blog. He hasn't updated the content in years, but it's chok full of good information for field recordists.
youtube dot com / channel / UCHHf1h8k7MA6-AG8FXjnQSw
Booth Junkie's channel on Youtube is crammed full of good information for anyone doing voice acting or voice over work. His series for VA using Reaper is worth its weight in gold. (Ok, so electrons don't have a lot of mass, but you know what I mean.)
youtube dot com / channel / UCjL6MFoRxI9dbybAYO4uNzA
Allen Williams's channel on Youtube is likewise crammed full of good information for anyone doing location sound on a movie set. He's currently doing a series of videos for boom operators that's loaded with good information.
gearslutz dot com
One of the better communities for all things audio, not just recording.
groups dot yahoo dot com / neo / groups / micbuilders
Getting a little more esoteric, but this is probably the best community resource for people who build their own microphones and recording gear.
Most of the rest of the audio bookmarks in my browser are probably too niche to be useful, but I hope this helps.