This plugins are only suggested and are optional for every WP platform user.
Akismet – This is already installed on wordpress, you just need to activate this by getting the code to the main site. This plugin will prevent and catch spam comments before they swarm into your blog.
CommentLuv – This plugin shows a link to the last post from the commenters blog by parsing the feed at their given URL when they leave a comment.
Google Analytics for WordPress – For beginners who don’t understand the codes inside your template then don’t bother getting into it or else you might end up on an ERROR. Use this plugin for Google analytics given code. It’s easy to setup.
LinkWithin – This plugin shows some of your recent articles at the bottom of your posts. This will allow visitors/readers to access another suggested article within your blog without going back to the homepage.
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SexyBookmarks - This plugin shows social bookmarking sites. This will allow visitors/readers to share your articles on their social networks.
(Screenshot)
SRG Clean Archives – I suggest installing this plugin to your blog as this will make a clean archive of your articles. More important elaboration for this plugin here.
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WP Super Cache – As suggested by every wordpress user, installing this plugin is very vital. This is a very fast caching plugin for WordPress.
Remember: If you are not using the plugin anymore, delete it as it affects the loading time of your blog (more elaboration about this matter here).
Thanks for reading and keep coming back for more 
Super cache is a plugin I’m not familiar with. I’d better put this on my wordpress system.
Hi Walter,
If your blog is loading fine let it be, don’t install WP cache anymore as long as it’s doing well. But if you think it would be better to have this plugin then do it.
Jp Manching
A very important plugin, especially if you like interaction, is a ‘reply to comment’ plugin. As this notifies people when someone else has commented to the post, you are more likely to get return visitors.
Sire´s last blog ..A Recap On My Hottest Poems
Hi Sire,
Thanks for this addition, I never heard about this plugin yet. I am on my way of checking it out. I know this is a great and useful plugin.
Jp Manching