Take a look at this WordPress plugin WP Static HTML output
This plugin produces a static HTML version of your wordpress install,
incredibly useful for anyone who would like the publishing power of
wordpress but whose webhost doesn’t allow dynamic PHP driven sites –
such as MobileMe. You can run your development site on a different
domain or offline, and the plugin will change all relevant URLs when
you publish your site. It’s a simple but powerful plugin, and after
hitting the publish button, the plugin will output a ZIP file of your
entire site, ready to upload straight to it’s new home.