WP AJAX Edit Comments
WP Ajax Edit Comments (for WP 2.5+) allows users and admins to edit comments on a post. Users can edit their own comments for a limited time, while admins can edit all comments.
SEO Ultimate is an all-in-one SEO plugin that caters to your needs of Title Rewriting, Noindex Managing, Editing of Meta tags, etc.
Login with AJAX
Add smooth ajax effects during login,avoid screen refreshes for incorrect passwords and choose where users get redirected to upon login/logout. Supports SSL login and works on MU and BuddyPress.
B-oxmail (Sidebar E-mail Form)
This small widget will add a form to sidebar, which will allow visitors to send an e-mail/feedback directly from any page without visiting the contact page. Very handy!
WordPress Image Gallery Reloaded
Image Gallery Reloaded is a jQuery based WordPress plugin which replaces the default WordPress gallery with a highly customizable mouseover slide show and gallery for every post.
Bulk Delete WordPress Plugin
Bulk Delete is a WordPress Plugin which can be used to delete posts in bulk from selected categories or tags. This Plugin can also delete all drafts, post revisions or pages.
MiniCart will implement a mini-shopping-cart in your blog. You can add items from the admin side and embed the cart into posts. This can also be used as a donation plugin. By design, you can only show one item in a cart.
MailChimp’s Analytics360 plugin allows you to pull Google Analytics and MailChimp data directly into your dashboard, so you can access robust analytics tools without leaving WordPress.
Mass Custom Fields Manager
If you have custom fields that old plugins left of your posts and you want to get rid of them you can now do it with a click of a mouse. There are virtually endless occasions where this plugin can save you valuable time and effort.
Post Editor Buttons
This plugin allows you to add/build your own buttons to the WordPress post editor’s toolbar. For example you can add a “h3” button to inset H3 tags in your post by just clicking a button. There are virtually endless buttons that you can add to your editor toolbar. One of my favorite plugin so far.