I have a couple of sites which include blogs. I've never really 'bothered' much with SEO. I just write, and usually my pieces are quite long and comprehensive - I like to think I know what I'm talking about. I don't post that often either, maybe once or twice a month. It's a time thing. So my hits are fairly low (although I've never compared them to anyone else's).
Writing is a bit of a passion for me and I think if I had to research which words everyone else is using and include them it might be a bit of a killer. So, what I want to know is if anyone else has REALLY had a lot of success with targeted SEO or PPC and has seen a dramatic increase in numbers?