In order to search your wordpress blog in Google, you can add your site into Google Webmaster Tools. After that, to make the search better, you can create a sitemap.xml file in your site and let the Google spiders to read it. For me, Google reaches my sitemap.xml in just a few minutes after I submit.
To manually update this file is stupid, we need a plugin. Here, arne created the plugin. Go and see.
There is also a demo here by Andre.
This plugin is good. It supports both Wordpress and Wordpress Mu. Easy to install as other plugins, by just uploading the unzipped folder to your wp-contents/plugins folder.
Try it out.
