I haven't seen anyone post one. I needed a system to move items from my mob trap tower to my already existing filter system. However, I didn't want to either lose the lower levels of the trap nor have the hassle of a tiered water system. So I came up with this, the whole system is 12 wide by 3 high as I wanted it as flat as possible. Also if you don't have a lot of dispenser blocks you could use pistons, I just find them too noisy:
Overview from the source of your system
One of the water-gates used to push the items downstream (open)
One of the water-gates closed to allow items to flow past
This prototype is 34 blocks long and took the items 1 min 20 secs to travel, so I am assuming at around 70-80 blocks I'll need to insert a hopper to reset the decay timer. For me that is just about the distance I need to move items, other wise one would need to use a hopper with a lift system like the Archimedes' screw, to level it back out.
I found the timing required the signal to start at the destination, and here are the timing that is exactly the same for each gate.
Not sure if anyone will find this useful, also if you see any improvements let me know as I'll be moving the system in place later today unless Flower comes out with an update :)