I use this plugin with almost every installation of WordPress. It provides such a great way for people to customize sidebar content without having to know HTML. It's clean and flexible. I love that it also has an easy shortcode button, so clients can style content in one place and use it repeatedly on their site in page and post content as well. I just made a $8.00 donation to the plugin. I have included it in the "Must Have Plugins" class I teach in Boulder, Colorado.