In the summer I love to make bbq chicken.
I put the chicken pieces in the slow cooker with onions and carrots, cover with water cook on low until I get home.
Then I drain the chicken (save the stock for other stuff) and put the chicken on the bbq with my favourite sauce.
I don't like chicken cooked just on the bbq because I find that the oustide is dry/burnt by the time the inside is cooked. Cooking it in the slow cooker means that it is cooked but I love the bbq flavour it gets (and it is nice and fast after work).
(I bet that the same thing could be done with other cuts of meat, like pork chops and ribs.)
You can also use the slow cooker to make pulled pork, shredded chicken, etc for salads, tacos, burritos, etc.
I really like the slow cooker because I have food waiting when I get home and in the summer it does not heat up the house.