Its mostly centered on blogging and static SEO sites, a combination of SEO, kw targeting, and a few other things.. but take a peek at
www.insidewebmastering.com , a project set up to help people brand new to the biz. I help in it with a few others who have done rather well in the biz, though warning its centered around hard work and determination .. not just building half a dozen sites and sitting back waiting for the $ to roll in.
I understand you are not brand new, and its often harder to help those who have been around for a while because they often can't be helped, but can't hurt to take a look, especially if your sales are as low as you say