Hi,
I've just discovered a nifty on line veg patch planning tool, so though I'd pass on the details.
I'm guessing if you're an experienced veg grower it might not be that useful and if you know what you're doing you can easily do the same with a pen and paper, but for any newbies to veg growing it's worth a look and you can try it out for free. You construct your site plan, then add the veg, it calculates how many you can fit in your patch, sends you reminder emails about planting, works out your crop rotation and successional planting for you and also has a square foot gardening function. There's loads of useful info and advice as well.
The website is
www.growveg.com