You should make the semi-automatic tree farm ivy made.
It will be very useful for gathering lots of wood easily and efficiently.
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FeI4jz.png&hash=0fe427f765076c80db68ef67a21651e7)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FWVplp.png&hash=4bcfec90b25dfaba323eeef021bd36d4)
The point of the device is that when you bone meal a sapling, the sapling turns from a transparent block into log, which is solid. Therefore redstone currents can pass through the log, powering pistons that push the logs into an area where you can cut all the wood down easily.
This would be very useful for both singleplayer and multiplayer.
A piston Door with Pressure plates. The easy way.
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fimg855.imageshack.us%2Fimg855%2F2473%2Fhow2e.png&hash=f12e00c158efed5257da24490af94758)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fimg593.imageshack.us%2Fimg593%2F1287%2Fhow22.png&hash=6e6bfa378dfb762847bd99f382fefe39)