Cooking

101 Cookbooks – Excellent, generally healthy recipes, many of which are vegetarian.
La Tartine Gourmande
Chocolate and Zucchini – also available en français.
Stone Soup – Dedicated to fast, simple home cooking.

Gardening

66 Square Feet – a balcony farm in Brooklyn. This blog also has particularly lovely photographs.
Fast Grow the Weeds – About an organic garden in SW Michigan.