Worm castings used to drive my father in law wild. He has done everything you can imagine to bring those little buggers to the surface in his garden.There are few things that impart such nutrients into your soil. This is a great article on vermi-composting or using a castle of worms to break down your food scraps and whats left gets transplanted into your garden to impart incredible growing power. The article covers great information on the container, the compostable materials, the worm bedding and even what type of worms work best for this application.
The article ends with a couple sections on maintaining the worm farm and harvesting as well. This is when you transport tall the hard work of your worms to those garden beds of yours. You will reap incredible benefits from having access to this consistent production of worms for your garden.