To adapt standard recipes for the slow cooker: Estimate 2 hours on low or 1 hour on high for every 30 minutes of cooking time in the original recipe. Brown meat and saute the vegetables to maximize flavor before combining them in the slow cooker. Vegetables, especially root vegetables, cook more slowly than meat and should be placed in the bottom of the cooker so they can heat directly in the cooking liquid. To compensate for the steam that will collect, decrease the liquid called for in the oven or stovetop recipe by 1/2 cup. Any dairy ingredients, such as milk, cream or cheese, should be added during the last 30 minutes of cooking as they may curdle if cooked too long."
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Not just crockpots but still a great blog: