I've found that if there's much work to gardening, I'm likely to ignore it for long stretches at a time. While I'm trying to change my behavior (I'm re-planting the front yard this year, for heaven's sake), maybe a simpler garden would help me blaze that trail:
Gardens-in-a-Bag: "The best part is that they are so easy to grow -- right in the leak-proof bag! Simply mix the enclosed tin of seed into the bag, add water and watch it grow."