Akismet

A very useful tool as your blog becomes popular; its goal is to stop spamming. You need to sign up for an account first and obtain the API which will then insert at the wordpress plugin ( admin panel )

Xml sitemap google

It generates a site map so that search engines index your blog better, furthermore, it updates search engines when new content is posted.

User photo

With this plugin you will be able to attach a photo next to your blog posts and comments, a useful tool that will help you add personality to your blog and make it a more reliable source. Readers want to know whom they are dealing with.

Wp seo

With wp seo you have more search engine friendly posts so that you are ranking higher at the search engines. Needless to say that no tool will help you rank higher if you do not use keywords and do not do your seo homework first.

Wp insert

If you decided to monetize your blog with google adsense then this is a plugin you need. Very easy to set up, you just select the area where you want the ads to appear and paste in the google adsense code.

Sexy bookmarks

Let your readers spread the word about your posts by submitting them to various social networks or email them to their friends.

Wp contact 7

I would not recommend that you reveal your email address when someone wants to contact you, so just install Wp contact 7, it creates contact forms where you can place at any page of your blog with a simple html code. It is very easy to set up.

Related posts

It gives a list of posts related to your current post, a useful tool to introduce more content to your readers.

Tweetmeme

A publisher tool to encourage your readers to share your content on twitter, it shows live tweet counting as well.

Wordpress mobile edition

Mobile internet is gaining momentum so you need to make your content available on mobile devices, you simply install the plugin and any time someone wants to access your blog via a mobile device he will be redirected to the mobile version.