The first, How To SEO Your WordPress Theme, was written by Courtney Tuttle, of Court’s Internet Marketing School, as a guest post on John Chow’s blog.

The second, 5 Ways To SEO Your WordPress Blog, was written by Honest Ed.

Both have good information, though some of it is repeated.

And if you’re interested in looking at another way to remove duplicate content from your WordPress site, then take a look at How To Eliminate Duplicate Content in WordPress Up To 99% for a detailed tutorial.