here is a page from Petsmart of some pretty cool interactive toys. I have bought the bird, but the first time we flew it, Stryker, my big feral did a spectacular leap and took off for the woods with it. We have never been able to find it, so figure he munched it to death...LOL
I recently bought the Cy-Purr mouse for my cat, Ivo. I thought she'd like something that responded when she poked at it. However, I found that it is extremely loud, even for me. When it started sounding off, it scared her away. Unless your cats don't mind loud noises, I'd suggest staying away from the toys that make noise, unless you can hear them before you buy them.