For self-hosted WordPress blogs, now there is a new WordPres plugin called "Google Site Verification Plugin" that completely automates Google Webmaster Tools site verification process!
You can install it directly from the "Install Plugins" control panel built into your WordPress blog, or you can download the ZIP file from the WordPress plugin site, and upload it your wp-content/plugins folder.
"Verify your blog with Google with only a couple clicks! No need to copy and paste tokens anymore; this plugin makes calls to the Google Site Verification API to automate the entire verification process," reads the description of the plugin.
Once your site's ownership is verified in Webmaster Tools, you can receive specific statistics and information (e.g. relevant search queries, malware notices) about your site directly from Google, or use a growing number of other Google services.
Download: Google Site Verification Plugin
[Source: Webmaster Tools blog]