Hi Runnerbean,
When I first started gardening I bought a copy of
The Edible Container Garden, by Michael Guerra. It's all about getting as much as possible out of small spaces, and includes chapters on all the basics, like soil and compost, watering and feeding, pests and diseases. It also has a useful section that lists the sizes of containers that various veggies, fruits and herbs need.
The thing that I like best about it though, are the pictures - the are some beautiful and very inspiring pictures of container gardens.
In fact I'm going to get my copy out right now
