How to Change WordPress Sidebars:

What Goes in your WordPress Sidebar
There are favourite sidebar items that marketers like to use to help the visitor experience and to reap better financial rewards as well. You can test a variety of them to see what works better for your needs.

Social networking badges help you build a following on other places, besides your own website. You might put a “Follow me on Twitter” badge, a FriendFeed badge that shows the latest web 2.0 items from you, or a FaceBook badge that lets people navigate to your profile and can help you grow your friend list.

Continue...WordPress Sidebar

From: http://mission0ps.com/easy-wordpress/wordpress-sidebar.php