Most of the blogs nowdays built on wordpress and for better great search engine optimization (SEO), it is always advisable to use plugins for wordpress which are quite easy to install. These are some of the plugins to use, but there are lotsn lots more which can be used too!!

All in One SEO Pack – One of the most popular SEO plugins ever for WordPress, this plugin does a bit of everything for you from helping choose the best post title,meta tags, keywords, & to helping you avoid duplicate content and more.

Google XML Sitemaps – An essential tool in for any kind of SEO .  Though the name only mentions “Google,” this plugin creates an XML-sitemap that can be read by Ask, MSN and Yahoo also.

Nofollow Case by Case – This plugin allows you to strip off the “nofollow” command from the comments, and then you can also apply it to only the comments you don’t wish to support.

SEO Friendly Images –This plugin is very useful for blogs with lots of pictures n graphics , it helps you with making sure that you have “alt” and “title” tags on all of your images so that the search engines can properly index them.

Simple Tags – This plugin helps you choose the best tags for your posts by offering suggestions, auto-completion of tags as you type, an AJAX admin interface, mass tag editing and a whole lot of things.

SEO Title Tag – Tags ina blog are an important part of the site for making sure that search engines know where to place posts, and SEO Title Tag plugin focuses exactly on this.

Redirection – For any reason if you sometimes need to move a page from one spot on your blog to another, then you are at the risk of losing that page’s status in search results.  Redirection helps you with your 301 redirects, captures a log of 404s so you can work on correcting them, sets up an RSS feed for errors and more.

HeadSpace2 – This plugin helps you to install all sorts of meta-data, add specific JavaScript and CSS to pages, suggests tags for your posts and a whole lot more.

Meta Robots WordPress plugin – An easy solution for adding robot metadata to any page you choose on your blog.  You can use it to make your front page links into “nofollows,” prevent indexing of search pages, disable author and date-based archives, prevent indexing of your login page and numerous other features.

SEO No Duplicate WordPress Plugin – If you  have duplicate content on your site for whatever reason, SEO No Duplicate will allow you to state which version of the post search engines should index while ignoring the others.