Fence Gate

The Fence Gate, first mentioned on Get Satisfaction then confirmed by Jeb on Twitter is one of the many new additions to Beta 1.8, also known as "The Adventure Update".

Fence gates were in the PAX Prime version of the adventure update.

Fence gates are only opened by right-clicking (unlike doors and trapdoors, which can be opened by left- or right-clicking) and are not affected by redstone, and always open away from the player. A fencegate can be opened both inwards and outwards.

There are no double fence gates like double doors, but if you place two fence gates beside each other, they will act like one, although you should get stuck by the middle pole of the fence gate.

Bugs
When placing a Fence Gate on top of another Fence Gate, it will sometimes face the wrong way.

When you place a fence gate and place fence around it, it may be facing sideways relative to the fence but the fence around it acts as if it if facing the correct way.

Wolves apparently can't tell when gates are open.