space--which is where a dirty board would sit until it could be hand-washed. if you're worried about germs, that's what the sanitize button is for.
2. measuring tools: i'm covering both the cups and spoons here. when you bake, it's so important to measure things accurately. your recipe may be screwed up beyond repair if you just "eyeball" how much flour or sugar you need. make sure you have at least a cup and a half-cup measuring cup, and a tablespoon and a teaspoon measuring spoon.
4. knives: your knives are really important tools. if you're spending $$ on anything in your kitchen, go for quality knives. even if you have a 