Are you finding that the dock's four app limit just isn't enough for day-to-day usage? If so, then you may want to give Docker a shot.
Docker is a new jailbreak tweak that doubles the capacity of your dock, allowing for up to eight different apps to reside there. It accomplishes this feat by adding a bottom drawer that's accessible by means of a simple swipe up gesture on the dock. Anytime that you wish to access the extra items in the dock, just perform that same swipe up gesture.
Docker is simple to use, but it's not without its fair share of issues, at least in its current 1.0 build. Check out the details inside to see.