Technorati is a blog (and anything else with a feed) search engine. It also allows you to bookmark sites online and find out how many other blogs are linking to you. You can search blogs by “tags” or keywords. Technorati plugins will allow you with ease, to insert tags at the end of your blog post automatically or manually from a list. This allows technorati to pick up your posts when someone searches on the tags option on Technorati. Google Blogsearch will also pick up on these tags, to help for their search purposes. Submitting your site to Technorati also seems to help get your blog posts indexed and at sometimes instantaneously, as Google spiders are constantly spidering Technorati.

You can find many different wordpress technorati plugins to choose from here