Re: Raised beds: more how-to questions.
I live on a steep hillside and have had raised beds for 20 years here. Just built some more. To level them, one side (the downhill side) will always be out of the ground if the other (uphill) is even with the ground.
In some cases I bermed the soil up on the downhill side so that the lower sides of the wooden beds are really in the ground. I think you can see what I mean in this photo (the downhill side is to the right).
On the new raised beds I just had built, we are adding an additional 8 inches of wood on the downhill sides at ground level to fill the gap, because the slope is that bad. I recommend a stable, permanent solution like this — either one side dug into the ground, to achieve a level bed, or one side using more lumber and staying out of the ground but being deeper.