How cool is this? I usually just lay a yard stick down and hope for the best. I would bed this makes for much neater rows. And if you're spatially challenged like me, it could certainly simply things.
If you're not as motivated to sit around drilling holes, my suggestion is to either ask someone to do it for you...oh my sweet, dear, husband.... Or of course, if you're not a cheap ass like me, you could buy the Burgon & Ball Seed And Plant Spacing Rule, as pictured above.
And if you're not into the holes, there's this one from Prima Gardens.
Can you tell I'm itching to get my seeds in the ground. Stupid cold weather.