My current main job in the garden at the moment is burning all traces of my potato plants after a server attack from blight. Although its not all bad, I do still have parsnips, mixed salad leafs, rocket, tomatoes, courgette, pumpkins, runner beans, corn in the ground ready for harvesting over autumn.
My Tips:
Only take out organic matter thats for consumption, compost everything else.
Don't leave bare earth over winter as some nutrients will be washed away (use a green Manure Crop for large bare areas or mulch).
Mulch every year around plants.
Leave grass cuttings on the lawn (short regular cuttings) so it breaks down and allows the nutrients back into the soil.
Grow confrey to be used as a liquid feed, compost activator or as a mulch.
Try and create balanced eco systems (mimic nature).
Go organic wherever possible.