Just talked about edging with Jon...Perfect resolution to our problem. Laying flat brick along your garden bed borders makes it easy for a mower to keep grass in check without the need for edging or trimming. Get DIY instructions from The Family Handyman.
DIY: Garden Stakes from paint stir sticks. Choose your colors to all coordinate or use bright primary colors. These would look great if you wrote down the scientific name next to trees and bushes. A great idea for landscape or vegetable garden.