Oh my goodness! They are so cute! My daughter is going to squee so loudly when I show her those pictures! I love slugs and spend quite a bit of time on rainy days getting them out of the street. Now that I know they can be kept as pets, I'm sure she'll be asking for one too!
We had this one type of slugs called ariolimax columbianus (also called a banana slug, although there are three kinds of these) that I loved to find in Washington state! They were just so huge! I was told that they were endangered though, so I never tried to keep one.