There is still lots of activity everyday here. Many of those who've been here since the beginning seem put off by many of the newer members who don't treat others with respect and seem to be here to score points in an imaginary of "Who's The Expert?". For an all-things-audio perspective, this site is still the best online IMHO. It's far from dead.
I also used to read AudioAsylum regularly, but it really seems to have less participation than ever and it feels like the average participant there doesn't really want to hear much about anything newer than the Elcaset.
Computeraudiophile and headfi both have vibrant specialist communities. The former is teeming with knowledge and constant product updates both on hardware and software, but the tolerance is low for newbies who are too lazy to search archives before posting questions that have been covered. For me, it's currently the place with all the real audio action, even though I wish that were still here.
Headfi is the place for all things headphones and related gear. It's a very young & global community and "My 'Murica" will need to open their eyes & hearts a bit in conversation with many ESL typers, etc. Hey, remember that their English is better than my Norwegian, Mandarin, etc!
Audio enthusiasts are still busy online, we might just all have to dig a bit more to connect. Cheers,
Spencer