W3 Total Cache – The fastest and most complete WordPress performance optimization plugin. After you use the w3 total cache plugin you won’t go back to using WP Super Cache.
WP Super Cache – WP Super Cache is a static caching plugin for WordPress. It generates html files that are served directly by Apache without processing comparatively heavy PHP scripts. By using this plugin you will speed up your WordPress blog significantly.
Contact Form 7 – Contact Form 7 can manage multiple contact forms, plus you can customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and so on.
Share This – This is a very useful plugin that allows your visitors to share a post/page with others. Supports e-mail and posting to social bookmarking sites.
Fat Free WordPress Social Share Buttons Plugin – This is a very simple and FAT FREE share button plugin that adds Google plus one, Facebook and Twitter share buttons to your blog posts.
Google Adsense Plugin – Google AdSense Plugin allows you to set parameters of the ads displaying, such as format (text ad, image, text with an image or link), size, color of the elements in the ad block, rounded corners and the ad block position on the website.
Simple Google Adsense insertion – Easy to use WordPress plugin to insert Google Adsense to your posts, pages and sidebar.
Adsense-Deluxe – Place Google AdSense ads in your WordPress Posts. Capable of handling complex adsense management.
Simple Photo Gallery – If you are looking for an effective, reliable, yet simple to use photo gallery plugin, then check this gallery plugin out. I use it whenever I need a photo gallery plugin.
NextGen Gallery – The most popular WordPress gallery plugin and one of the most popular plugins of all time.