Hi Dags,
WordPress provides a great collection of plug- ins. My favorite WordPress plug -in is All in One SEO Pack, this plug- in is definitely very important because it is essential to rank high with the major search engines(such as Google, Yahoo and Bing).
There are other important plug-ins I would like to share:
1.WP- Insert: It is for a privacy policy.
2.Google XML Sitemaps: It tells where your page is located.
3.Sociable: This plug-in enables visitors to share the content on your website with their friends on Facebook, Twitter, etc.
4.WP Maintenance Mode: Adds a customizable “under construction” message to your blog while you get your entire content ready to launch. For more information you may visit simplewebsitetutorials, where they provide information regarding how SEO plug-ins work.