Let's just put the brakes on here, keeping in mind that this forum is primarily about web design (in other words, not so much about marketing your product via the Interwebz, etc). This thread is beginning to sound like the old and unlamented SEO forum.
First, reference Mikl's post above. HTML and CSS can be produced by anything that will generate pixels, from Notepad to Dreamweaver. Google doesn't care what produces a site. Wordpress is not for designing sites, it is a blog engine with CMS capabilities. Wordpress mavens create a kajillion templates for use with the program, and that's where the focus on design (and SEO) largely takes place. It is true that some Wordpress sites do well in Google, but I doubt that being a WP site alone has a lot to do with that favorable placement. Strong content, good usability, good outreach, good community-building practices, good participation from users, and so forth put most of those sites onto Google's first pages, I would think, over "it's a WP page, Google slobbers over those."
Next, SEO is a marketing concern as much or more than it is a Web design concern. You can call me a purist or an idealist or an anti-money commie or whatever, but I firmly stand by the principle that if your site is well structured and coded that 90-99% of your SEO concerns are handled in the context of good design based in best coding principles. Trying to get your site to vault to the top of Google over five dozen sites all selling the same widget or whatever is not a primary function of Web design -- though from my experience, I guarantee you that having a well-designed site will go a long way towards propelling you over at least half of your competition solely because of their sites' poor coding and design practices.
Finally, this thread is turning into another "SEO hoodoo" discussion: people making obvious and superficial suggestions in order to Make Big Dollarz With the Quickness Yes Precious via SEO magic. It ain't happening, people. Worry more about your ability to produce strongly designed, strongly coded sites and most of your SEO concerns will become essentially irrelevant. As far as trying to Find the Magic SEO Bullet, it doesn't exist. If you insist on continuing snark hunting for such a thing, more power to you -- the time you waste in that fruitless venture is time the rest of us get in stealing a march on you.