Oh, too many to list! I watched a fair amount of those old cartoons like Tom and Jerry and Scooby-Doo, but I never liked them much (I had the formula for Scooby-Doo figured out even then). I really only watched them because there was nothing else on. I also saw a lot of Cartoon Network shows like Cow and Chicken, Courage the Cowardly Dog and Johnny Bravo. For quite some time I was addicted to the Powerpuff Girls. Nickelodeon was another channel I frequented (The Fairly Odd Parents, Spongebob).
But, when I was a kid, I thought all of these shows paled in comparison to anime. Pokemon, Digimon, Sailor Moon, Yu-Gi-Oh!, Hamtaro, Cardcaptors, Zoids, Sonic X...I watched a lot of them. Those were some good times. I don't see a lot of anime on TV anymore (besides Pokemon, of course), which is odd.
Also, is it just me, or are cartoons not as good as they used to be? The only new show (well, new-ish) that I enjoy is Avatar. Everything else seems to have lame jokes and generally boring concepts.