Debbie&Theo - Egads, I hope you won't have the same kind of stubborn bunny as Fujoe. She really has been through the ringer.
Your bunny is reaching that 3 month mark of sexual maturity, and this is the time when their hormones are making them wacky. Are you planning on getting him neutered? That usually helps settle them down (though young bunnies - under a year, can really be a challenge, but at least neutering does help not only with destructive and territorial behavior, it can also help with litter training)
Most bunnies will learn the word no, but what they learn is just don't do it when you're looking. (though some bunnies don't care if you watch!)
Try perfume or lemon oil. Also check out the "House Proofing" section on this site for more tips. You'll see you're not alone. My favorite pair of jeans and shoes were a prime target.
Cords that are on the floor all the time should be covered with cord covers (I prefer the perforated coils - also on that House Proofing page) For other items, like a walkman etc, I agree with Fujoe that you'll have to keep those things out of harms way.
Keep us updated!