University of Florida Extension has a lot of good container gardening information
For how-to info and ideas see the Guide to Container Gardening, which explains how to select a container, light exposure, the growing medium, fertilizer, watering requirements and lists a selection of suitable annuals (by no means complete).
See Choosing & Combining Plants for Containers taking into account Balance, Contrast, Color, Bones & Focal Points
Better Homes and Gardens has a good site featuring, among others, containers for shade, and for butterflies. It also has container garden plans and a slide show of 12 no-fail perennials for the South.