I am loving all these crockpot ideas, so I thought I'd add a few more. This one is so easy!
1 bottle barbecue sauce
1 can of crushed pineapple with juice (or canned pineapple chunks if you prefer)
1 clove of garlic, chopped
half of a chopped onion (optional)
3-4 chicken breasts
Mix together the first 4 ingredients in a bowl. Place chicken in slow cooker. Pour contents of bowl over chicken. Cook for 4 hours on High of 8 hours on Low. Serve over rice (optional).