Google, Yahoo and Bing (MSN) all have nice Webmaster tools.
Many suggest using a Webmaster plugin for WordPress to help verify ownership with these sites, but not me.
I don’t like adding code to a site that is only used once, So here’s how I add the Webmaster verify codes. Add the META tag to the “Additional Home Headers” field in All in One SEO plugin and update. That’s it. You can remove the code after you’re verified.
Major Site Webmaster Tools
Don’t forget to setup your Webmaster accounts fully. Add your sitemaps, your feeds and home urls to each service.