Froot Loops has always posed a bit of a challenge, as it's geared towards an age group that can't be marketed to in the traditional ways. Rather than focusing on the food, when we approached Froot Loops, we focus on the experience.
The Flash site that we designed, maintained and updated for many years was filled with games, online and offline activities, and comics. It's goal was to be interactive and fun, and keep kids coming back for new experiences.
We created a Passport and Stamp system to encourage the kids to continue playing new games as they came out. Each new campaign included new interactive elements that they would then get more stamps for.