Of the 10 cereals most marketed to kids, six are General Mills cereals, including Trix, which is also the most marketed cereal to children via the Internet. At sillyrabbit.com, the mischievous Trix bunny races through space, energized perhaps by the cereal it's named after, which is 38% sugar. Kids can also watch cartoons on the site called TrixToons. And Trix's television ads, which kids see seven times more often than adults, direct kids to its advergaming Web site more than any other brand.