SEO forums allow new webmasters and industry veterans chat in near real time about search engine news, SEO techniques, and other webmaster topics.
After an SEO forum grows exceptionally large the signal to noise ratio drops to where it can become frustrating. Many SEO forums have a set tone about them, which is either really good or really bad depending on whether or not you like that tone.
I recommend searching around to find a forum that does not have a set tone or one that has a set tone that resonates well with you.
Top SEO Forums
Search Engine Watch Forum - New search engine forum which is still new enough to have a great signal to noise ratio. This forum also has many top SEO experts and a rather open tone which I find enjoyable.
WebmasterWorld Forums - Brett Tabke's webmaster forums.