Can you tell me about raised bed gardens?

Image by suburbandollar
This is one of two raised beds I am using to grow vegetables this year. As you can see I have sectioned the bed off into square foot sections for use in the square foot gardening method of growing.

Along the backside of the bed there is a vertical trellis made up of galvanized piping and nylon netting.

Question by wingedstrider: Can you tell me about raised bed gardens?
I’ve never had one, but I’m moving, and I think they are really pritty, so I was thinking about giving them a try at my new place. I don’t understand how they are used though. I mean, you have to use a tiller every year on a regular garden, but you can’t do that if the garden is raised bed, so how do you get the ground loosened up every year, or do you have to take down those boards and put new new dirt in them every morning.

Can you help? Leave your own answer in the comments!