Ad Rotate: This provides a “rotating” call to action in the information column of the blog. The people who visit your blog are likely to be interested in other things than you. This puts multiple calls to action in one small space.
Akismet: This is a comment spam blocking WordPress plugin and absolutely essential for any blogger.
BackWPup: This makes sure your blog is backed up without having to think about it and can be scheduled and also saved on to another external server apart from your website hosting provider.
Floating Social Bar: Floating Social Bar is unique in the world of a ton of social share buttons: They stick to the top of your screen as you scroll down. While there are similar ones that work on the sidebar, these sidebar social share plugins aren’t visible on all mobile devices.
Google+ Blog: This plug in allows you to send posts from Google+ to your WordPress blog by adding a hashtag to the post.
Leadpages: GREAT plugin that is truly the world’s easiest landing page generator.
Magic Action Box: Magic action box is a fantastic plugin to use which you can instantly place a sign up form at the end of every blog post. It makes the job effortless. Another advantage is that it can be connected with your Aweber and MailChimp accounts thereby making it easy for you to gather new blog subscribers. This plugin can help you get more people to sign up for your blog updates. If you would like to, you can also use it as a popup form.