Have you ever found yourself opening your iPhone's apps by accident? Perhaps you're navigating from page to page, and you finger slips, launching an app that you had no intention of opening?
If that scenario sounds all too familiar, then DoubleTapToOpen may be just what you need.
DoubleTapToOpen is a recently added tweak to Cydia's BigBoss repo, that requires you to double tap an app icon before it will launch. Personally, I find this tweak to be a bit over-the-top, but check inside and judge for yourselves...