SBswitcher a tweak for iOS which will basically add a new pane over the multi-tasking pane, which will allow you to bookmark nine of your most-used apps. Now this new pane will allow a very quick access to all your favorite apps. This app also gives you an easy access to a few of your System Settings. Bundled with its core feature, this app is definitely worth $0.99. Props to the developer Tolani. He has added in the release notes that this tweak is not yet available for iPad but should be soon.
