I use non-enclosed raised beds. Every year I till the whole patch, then dig out trenches/pile up soil in the beds.
It makes for a lot of work at the beginning of each season, but it allows me to till and amend the whole plot all at once and makes crop rotation easier. The way my yard drains, raised beds of one sort or another are a necessity.
I'm getting to a dilemma. I've put it off one more year but I'm going to need to make a decision. I've worked hard over the years to transform my plot from rocky clay to good loose topsoil. In the meantime, a nearby black cherry has worked just as hard to grow taller and taller and it's now shading a good third of my plot for most of the afternoons.
Move the plot? Or cut down the tree?
(Also, I set my tomatoes and peppers out yesterday, and now they've changed the weather forecast to call for patchy frost tonight.
I wasn't planning on rolling out the row covers already. )
ETA: Lisa, after several frustrating years, I found the only thing that keeps groundhogs (aka woodchucks) out is electric fence. A small four-volt solar charger is plenty and not too expensive. One strand about three inches off the ground, one strand about eight inches above that with a ground wire between in case the raccoons try to climb it.
Eight feet of light poly netting with a string of twine on top is usually enough to keep the deer out. 
You'd think these animals were starving, instead of having thousands of acres of pasture, woodlands and farm to graze. But no, they need my beans, tomatoes, greens, parsley and squash. All of them, if they can get them, and there have been years when they did.
Last edited by OakLeaf; 05-17-2009 at 02:41 AM.
Speed comes from what you put behind you. - Judi Ketteler