SEO advice is generally worth how much you paid/didn't pay for it, or at least that has been my experience
I have tried to do my own SEO with a certain level of success I guess ... and I have found that any "free" SEO advice or tutorials (I used to get all kinds in my email - WEB PRO NEWS etc.) are not usually worth shit.
It seems that true SEO is a well guarded secret, and for good reason - your ability to drive SE traffic to your website is one thing that will make or break ANY website !!
I have dealt with a few SEO companies, and a few individuals also, and usually got results much better than trying to wing it on my own.
Currently I am dealing with "Panky", who is a free-lance SEO consultant/marketer, as well as a moderator at both Xnations and STFU.
Her rates are very good for the service she performs. She looks at your site, and gives you a couple pricepoints and SEO strategies to chose from, depending on your budget.
I would recommend her to anybody who cannot afford, or does not want to pay 4 figures a month, (or MORE!)
Panky's ICQ is 511-400-74