GeoURL plugin allows you to configure your real-world location in order to find other websites nearby to you.
This plugin allows you to insert the meta tags into your blog so that it can be located by GeoURL. It then invites you to ping the GeoURL server to get yourself added to the database.
For interest's sake, the meta tags look like this:
<meta name="ICBM" content="51.50038, -0.15482" /> <meta name="DC.Title" content="Your blog name" />
I thank Nikolay Kolev (kolev) whose MyOpenID plugin provided all the knowledge i needed to write this.