As far as I know studying SEO also can be using some plugin for optimizing our blog or our site. These plugin can be gotten freely by downloaded it and install them into our website. Here are some plugins being used by most people for optimizing their blog, include me:
- WordPress state plugin. This plugin very easy to be gotten. You can get it from wordpress and install it. This plugin used to watch how many visitors that come to your site in daily, weekly or event monthly. From this plugin you also can know what keyword that your visitor typed is to come to your site. By this report you will know what keyword that most searched and less searched by visitor. Not only this the most viewed page also will be shown by wordpress state. From both report we can decide what step we have to use for next blogging.
- Aksimet plugin. This is wordpress plugin that will protect your comment form from spams. You can see this when you enter admin area and you will be shown that you already got some comments and also get some spams. This is difference when you don’t use this plugin. Your comment area will be filled with spam comments.
- Simple Tag plugin. This plugin very useful for us when we want to optimizing our website. When you making an article it will help you to gain tags based on content that you make. You can decide which tags you have to insert among many tags that occur. This is helpful since you don’t need to do it manually. It also can give tags that related with yahoo search engine. So installing it is good decision.
- All in One SEO pack. It also help you in making article that will effect to your maximizing website. It helps you in setting up title tag, description, keyword for both, home page and also for individual post. This setting can influence to your SEO optimization.
- Comment luv plugin. You can detect a site use this plugin when you place comment in comments form. When your newest post appear means that this blog has install comment luv plugin. By this way your website used by all commentator to promote their latest post.
- WordPress ajax edit Comment. It helps commentators in giving comment your article. They can edit their comment when they know that they need to rewrite what they already submitted.
- Headspace meta data. This plugin is used to control all of SEO need like keywords, tags and the other need.
- Drop Down Menu. This plugin helps you to manage menu in your admin area that own sub menu like WRITE MENU by targeting our cursor to this menu we will get sub menu only by clicking on it only once.
- Sociable. This plugin provides many social bookmark that can help you getting more traffic. Like traffic from digg sociable or the other.
- Do follow. A plug in that will allow to check every link that you include in your article. In other word Google also will visit site that has redirected from your article. If you are reviewer you have to know that advertiser glad when they know that you install it into your website.
- This is the last plugin that I use. Google sitemap xml. This plugin is very helpful since it will inform every page that you have updated to Google search Engine. By this way the page indexing process will done faster.
These are some plugin that I use in Optimizing, Probably some of you know better than me, share it for us. 
