Found this one at southernfood.about.com...
Sounds easy!
Never done ribs in the crockpot myself...
I prefer to dry rub them... cook in the oven at 250F til falling off the bone... and serve with warm BBQ sauce on the side...

Ingredients:
•2 to 3 pounds pork country-style ribs
•1 cup ketchup
•8 ounces cola -- Coke, Dr. Pepper, etc.
Preparation:
Combine ketchup and cola.
Place country-style pork ribs in slow cooker.
Pour cola/ketchup mixture over ribs.
Cover and cook 2 hours on HIGH then cook for 3 to 4 hours on LOW.
Baste occasionally if desired.



From the same site, a twist on ribs...
This sounds really good to me!
A German style ribs...

[color:"blue"]Crockpot country style ribs and sauerkraut, along with apple and seasonings.[/color]
Ingredients:
•1 bag sauerkraut, rinsed & drained
•1 onion
•1 red-skinned apple
•2 to 3 pounds country style pork ribs
•1 cup beer
Preparation:
Put sauerkraut in bottom of slow cooker/Crock Pot.
Add diced onion and chopped apple. Do not need to peel apple.
Stir and even top.
Layer country ribs on top of kraut mixture.
Pour beer over all.
Cover and cook on low from 8 to 10 hours.