Hobbes - 'Calvin and Hobbes' comics
Jinxy - The cat that flushes the toilet in 'Meet the Fockers' and 'Meet the Parents'
Snowballs I and II - from the Simpsons
The Thundercats - ok that might be a stretch
Kuroneko Sama (Lord Black Cat) - From an Anime series called Trigun
Spot - Data's cat from Star Trek TNG

... all i can think of for now