I’ve recently installed the Jetpack plugin, and I can say so far it was a wise choice. It has replaced four plugins, and added many more features on top of that. It replaced my contact form, Twitter integration, and social bookmarking plugin, all were more than I needed anyway. I’ve only setup two simple contact forms and they were easily changed over. The Twitter integration plugin was also easily replaced. Just had the widget setup as well as auto-tweet new posts both of which were included in Jetpack. If you’re looking for a plugin that has loads of features and tools that will help you run your site more efficiently, consider checking out Jetpack.