Custom Field Suite allows you to create and manage groups of custom fields.
Q2W3 Post Order lets you manipulate the order in which posts are displayed.
Bad Behavior complements other link spam solutions by acting as a gatekeeper, preventing spammers from ever delivering their junk, and in many cases, from ever reading your site in the first place.
Fast Secure Contact Form lets your visitors send you a quick e-mail message and blocks all common spammer tactics. Additionally, the plugin has a multi-form feature, optional extra fields, and an option to redirect visitors to any URL after the message is sent.
Gravatar Signup Encouragement encourages users without a Gravatar to make one.
Slick Social Share Buttons allows you to add Facebook, Twitter, Google +1, Digg, Google Buzz, Linkedin, and Stumbledupon social media buttons in a floating or slide out tab.