There are a lot of great recipes out there for freezing meals and then using the slow cooker. Most of them require you to thaw them in the fridge the day before.
Let me know if there are more that you'd like me to add to the list.
Who Needs a Cape - Crockpot/Freezer Cooking
Kojo Designs - Freezer to Crockpot Cooking
Kojo Designs - A month's worth of meals
Sidetracked Sarah - Freezer to slow cooker recipes