Google operators such as link:, site:, related:, info:, cache: and many others are used to modify search query or to perform a different type of search. Using them you can get specific information about website such as incoming links, cached version, etc. or refine your search to get more relevant results.
Go to Google Operators page [...]

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If you use Technorati and wish to get the most of it, you may be interested in Technorati library. It contains various widgets, such as browser plugins, applications, utilities written by third party authors, such as you.
More on this at http://technorati.com/widgets

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