iPod is tricky for anime because it doesn't have Flash ability (unless jailbroken, and even then, Flash is horrendous). animeonhand(dot)com works decently well, and sometimes Pinoy will work. If you didn't specifically want dubbed, I would recommend Crunchyroll, but most of it consists of subbed shows. It's hard for me to really tell you because I haven't used an iOS device in years, and download all my anime onto my tablet or PC.