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WebGuru is a terrific new webmaster forum and there's been a HUGE improvement with it in the past 2 months. The best one though is SitePoint. Get after them and you'll make it in the niche. They have some of the best posting quality in the world, excellent resources, superbly written books and articles. In my eyes they are the leaders.
When it comes to admin forums, TAZ is the leader, no questions asked. Hope to change this in few years, but right now they are the best admin community.