Just switched mine off with today's dinner - large gammon/ham joint been in for 4 hours on high with a splash of water in the bottom (2nd one this week, bit obsessed!), to have with spuds & cabbage later and sandwiches/ham & eggs the rest of the week.
Great bolognese/ragu recipe the whole family loves, especially the toddlers. The extract & recipe below comes from Giorgio Locatelli's 'how to cheat Italian', in The Observer years ago:
8. Use a slow cooker
Slow cookers are an excellent investment and very safe. You can make foolproof slow-cooked ragu in one. Put two kilos of minced beef, browned, two chopped carrots, a chopped celery stalk, two chopped onions, a bouquet garni, two cloves of garlic, a bottle of red wine, a litre of passata, five tablespoons of olive oil, a litre of water and some salt and pepper (this will serve eight) in the cooker first thing in the morning and then when you get home from work you'll have the best ragu.
I've found it goes much further than 8, freezes really well too.
Ditto what some have said about chicken & bones. I sometimes cook for 8 hours on low, which causes the bones to disintegrate, but 4 hours on high keeps it intact.
Also, did you know there are now sachets of mixes (Colmans) specifically for the slow cooker - check them out in the supermarket if you want a gentle introduction to slow cooking (haven't tried them myself yet)