Join a forum

One of the most effective ways to learn about internet marketing, SEO or any subject you could possibly choose is to join an online forum. There are forums covering every subject you could possible be interested in for music to photography, soccer to swingball... Someone somewhere will have started a forum that covers your subject.
There are many reasons to join including the learning experience, and the social aspects, but also the opportunity to post links to your sites and build up visitor stats.
I have joined a few forums recently, some of them niche, but one in particular is a general forum as much for social reasons as for advice or help. I have been a member of mmmtalk forum for a while now, and it is the forum on which I am most active, most of the members and admin are involved in work at home schemes. If you are not a member of any forums, mmmtalk is a great forum to get started with, and if you are a member of niche forums, consider joining mmmtalk if only to meet a sociable bunch of people who are interested in seeing your work and visiting your site.