SEO today, what's it all about? 
ddemchuk: of course it's worth it...if you're interested in proactive SEO, you need to focus on building relevant, targeted one way links to your site for the keywords you're looking to rank for. Start with long tail keywords (like 2004 nissan altima 5 speed vs. nissan altima) so there is less competition to worry about. As you build authority on those long tail words, it will become easier and easier to get ranked for the harder keywords. Use your target keywords in the anchor text of the links you build (so instead of "Click here" do "2004 nissan altima 5 speed" as the anchor text)The best link sources are:
web 2.0 site profiles that allow links
web 2.0 blog sites that allow articles with links
social bookmarking
article marketing
blog commenting
wiki links
directory links (though not too much)Don't go crazy on the number of links you build. There's no set number of links that are too much per day, but what's most important is consistently building links. That way the search engines see you as a long term authority site for your niche.Also, while on site SEO is a good thing, it really only amounts to about 10% of your rankings. It basically makes it easier for the search engines to crawl your site and determine its topic once they find you.It's all about links...