The purposes of this study are to determine: 1. If patients taking insulin lispro LM with metformin will have better overall control of their blood sugar than patients taking a long acting insulin comparator with metformin. 2. If there is a difference in the way the two treatments affect blood sugar control before and after meals and at night. 3. If there is a difference in the insulin dose required with the two treatments. 4. If there is a difference in the numbers of times patients experience low blood sugar with the two treatments. 5. If there is a difference in the effect on patients's body weight.