What is the best blog for personal branding?

wordpress.com is a good choice for almost any need, in my opinion.

You might be better off reading blogs tailored to each of your specific topics—particularly each topic is fairly broad as far as blogs go. For instance, for technology, are you interested in software, social media, internet, hardware, tech corporations etc. etc.? There are too many flavors to choose from.

Technorati.com might be a good place to start searching for blogs that are the movers and shakers in their blogging communities. And from there, you can bounce to the blogs that those bloggers read.

Wordpress is a good place to start off, and offers a broad range of SEO plugins.

Look on forums etc for tips on SEO, and post your website wherever you can, in your email signature, on forums, etc