Windowbox.com - Many short articles helping the reader to make the best of their container gardens, on the 'The Experts' page.
Suite101: Container Gardening - Monthly column by Kathy Reiffenstein on various aspects of container gardening, with tips on plant selection, design, watering and fertilizing.
Hybridtufa: Adventures with Hypertufa and Papercrete - Hypertufa definitions, history, and recipes for making troughs and planters. and hypertufa garden decor.
Balcony Gardening - General information on balcony and apartment gardening in a limited spaces.
Container Gardening - Information from the University of Connecticut Integrated Pest Management Program, including container and plant selection and cultural requirements.
Container Gardening Tips - Starter guide to container gardening with information on plants, soils and container types.
GardenGuides: Container Gardening - Hints and tips for container gardening and a list of annuals that do well in pots. Page 2 covers vegetables which grow well in a container garden.
Vegetable Gardening in Containers - Practical page offering tips and techniques, including variety selection, planting information, and common problems. From the Texas Agricultural Extension Service.
GardenWeb: Container Gardening - Forum for discussing all aspects of container gardening.
The Dollar Stretcher: Micro-Gardening - Provides benefits, methods and examples of growing plants and sprouts indoors in small pots.
Better Homes and Gardens: Container gardens - A collection of articles with tips, tricks and information on gardening in containers.
Tips for Great Looking Container Gardens - Series of pages from the University of Illinois Extension covers the basics: soils, containers, fertilizing, watering, and winning plant combinations. Also a few online videos.
Yahoo Groups: Container Gardening - Join 'Queen of Pots' Rosemary Basil to discuss container gardening.
Container Gardens - Covers several container gardening topics, including plant selection, soil, watering, and light considerations.