The most AMAZING production I saw was several years back, and it was...wow. They went with a lot of film-esque things but the scenery and effects were dazzling. They had a turntable built into the set, and they used it in several places. The first being, naturally, the tornado. The house sat on the turntable, and they moved everything else around it. Them, in Oz, they laid down sections to be the Yellow Brick Road, and to facilitate changes between the Scarecrow/Tinman/Lion Scenes. For the Poppyfield they had a cricular platform with a wall cutting it in half. One side was Poppies, the other was the tower for the Wicked Witch. And it spun back and forth for the varying moments. Then for the final moment, Glinda had floated on and was suspended partially above the Poppies/Witch Castle, the poppy side was facing the audience, and the wall bled through (it was a scrim), and as the Witch rose into the air on her broom (Similar to the "Defying Gravity" minus the cherry picker), the unit split and Emerald City rose up from behind it. The flying monkeys (aside from Nikko and two others) were on roller skates, and had a series of ramps to play on. For the return to Kansas, Dorothy stood on the platform, and it slowly spun, with the varying leads on it, and they quickly exited behind a black curtain to do the costume changes.
The worst I saw was a High School production. Some of it's "highlights" included:
Dorothy wearing black heels in Kansas and sheer pantyhose...no socks
Toto skipping with the Four Friends
No Poppyfield
A Pink and Orange Emerald City (NO GREEN PERIOD)
And FAR too much dry ice smoke.
Anyone else?
http://www.youtube.com/huskcharmer