In I'm Pusheen the Cat, a lot of these comics are gathered in one place, telling Pusheen's story - along with her family. They are very cute strips, no doubt, and if you're the type of person who enjoys buying picture books you might like this.
Totally PG, so you can give it to a kitty-crazy kid.
One drawback, though? I had seen many of these comics already, they were cute and everything, but I don't know how much of it is new material.
Anyway, is a nice little book, if you're the type of person who likes this style.