Something I didn't see mentioned so far: dental care! It's as important for them as it is for us.

There's cat toothpaste and cat toothbrushes, and there are also solutions that you can mix in with their water (been using this stuff for a while; it was recommended by our vet, and it's worked really well). You can prevent a lot of health issues down the line by taking care of her/his teeth and gums, and contrary to what some people will tell you, dry food does not keep a cat's teeth clean.