kvraudio.com is the best place to find out about new products, despite its (dis)reputation. Look past the whining, sniping and ignorance-based strong opinions and pick out the occasional gems. It's the primary forum for developers, the best place to speak directly to the person who wrote your software. Most vendors have their "official" support forums hosted there.
gearslutz.com is good for an occasional visit. The rampant ignorance is off-putting, but the sheer number of users (it's far and away the largest forum of its type) means there are some genuine experts in the crowd. The mastering and acoustics forums offer the best signal-to-noise ratio.
If you're into orchestration and/or sampled instruments,
vi-control.net is one of the more civil neighborhoods.
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