Couldn't be without my slow cooker, if only for making stock and soups. And chili.
Recipes are pretty much the same as usual, the great thing about the slow cooker is that you can let it all simmer away for a few hours (or many hours for stock) while you go on about your day, you are not tied to watching the stove.
Really, any recipe that needs to simmer in a pot can be adapted to a slow cooker.
(Stock is usually a 2 day process. Day 1, simmer the chicken carcass or marrow bones with veggies and herbs. Let cool overnight, remove the fat. Day 2 use the stock in your soup/other recipe.)
As I am from TX, shredded pork is an old favorite at our house but it seems like it is now quite a trend! Put a pork loin in, pour BBQ sauce over and let it go for the day while you are at work or out playing. Actually, any meat you like is good...turkey, chicken, beef. Shred it with 2 forks each pulling opposite. Serve up on buns with onions and pickles, or with whatever sides you enjoy.
I will do chicken breasts with enchilada sauce tomorrow.
Easy recipes abound on the internet - what do you need a cookbook for now-days? Print some off and try something new:
I make pulled pork with a bratschlauch - you get that in any Migros or Coop - it is a heat resistant plastic foil, formed like a tube.
I put the meat into the bratschlauch in the morning, put everything in the oven, heat up (60C) and leave it there till I come home from work. After 6-8 hours, you can pull the pork easily. It is delicious and doesn't take up space as a slow cooker does.
I know how to use a crockpot from my US times, nothing against it, it definitely has its qualities. But I love a simple, uncluttered kitchen and therefore, I abstain from appliances in general. Enjoy your crockpot :-)