Vegetable garden plan

My vegetable garden plan 2010 was created in February and still it's very rough planning and I can see, that if I want to plant all different kinds of vegetables I want to grow this year in the limited space I have, it needs more detailed planning.
So far I managed to plan the vegetables according to the rules of companion planting. Vegetables that don't like each other are separated and those which help each other grow close together.
I made this plan in powerpoint.