“About This Site” is a plugin for Firefox that makes it easy to check:
* Alexa traffic detail and related sites
* Del.icio.us linkbacks
* Google related pages, cache and link information
* Kinja site readers
* Netcraft reports
* Open Directory site listing
* Popdex search for citations
* Technorati link cosmos
* Wayback Machine archive
* Whois query
* Yahoo linkdomain
This plugin to show metadata is very useful for SEO as well as SEM.