One of the things we did was put a fence around the entire garden. That way, we can plant climbing vines, such as peas and cucumbers around the edge of the garden, so they don't take up space in the middle. This year we planted the peas on the outside of the fence so we don't accidentally kick or step on them while we weed the other garden beds.
We divided the garden into 4x6 and 6x6 foot beds. They aren't exactly 'raised beds', but my husband did build some frames out of 1 inch thick wood to keep the beds contained and the walking paths defined. He also built a watering system so that each individual bed gets water, and we don't waste as much water.
This way, when the beans grow, they are close enough together to help support each other. Also, they shade the entire bed, so that the weeds don't grow! Last year we had two 4x6 beds of beans, and they produced so well, that I froze about 2 quarts of beans every other day, besides what we ate, for several weeks!
I would definitely recommend planting beans this way, even if you do not plant in beds. If you plant in rows, make your rows 1, 2 or even up to 4 feet wide. You will get so much more out of your space!
The same thing goes with beets, carrots, radishes, etc. My husband planted the beets this year, and he planted them fairly thickly in rows about 4 inches apart. He figured he planted the equivalent of a 72 foot row in a 4x6 bed! When they get a little bigger, I will thin some of them out, and eat them in salads. Then, when they are bigger yet, I will thin them some more and eat them as baby beets and greens. What's left will be in a diagonal grid like the beans, to grow into big beets to freeze or can!
Hopefully this has given you some ideas for your garden! If you have any questions, you can leave a comment here, or e-mail me at firstname.lastname@example.org. I plan on having more gardening posts here in the future, so check back often! Happy gardening!