Allow you to do fast verification for WPMU websites with Google Webmaster Tools, Yahoo! SiteExplorer, Bing Webmaster Center & Alexa Siteowners.
TrustMeter Wordpress plugin – shows where your pages rank for their page titles.
Outputs a list of post-relevant keywords different from the categories. (Maybe useful for SEO).
This plugin insert a counter script into your wordpress blog. There are several designs and configuration possibles. You also can run this counter wit
A sitemap is good for users and perfect for search engines. WP Simple Sitemap is a Wordpress plugin that automatically lists all your posts.