Combine steak, flour, and 1/4 teaspoon salt in a large zip-top plastic bag; shake bag to coat steak.
Coat a large nonstick skillet with cooking spray; place over medium-high heat until hot. Add steak; cook until browned on all sides.
Combine steak, tomatoes, and remaining ingredients in a 4-quart electric slow cooker. Cover and cook on high 3 to 3 1/2 hours or on low 8 hours until steak is tender.
Cooking Light Low-Fat, Low-Calorie Quick and Easy Cookbook
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