Yes, this information is important to know because the majority of people would not think these foods would be bad for a dog. Being a member of a Jack Russell Terrier forum, I know all about the different things that are not good for a dog.
Did you know eating/chewing Azalea bushes can be toxic to dogs?
I assume, or at least hope, everyone knows the dangers of Antifreeze....something about it is sweet to animals, cats and dogs both love to lick it. So take super caution when putting antifreeze in your car, rinse your driveway well, etc. Don't leave the jugs sit within reach of your pets.
And of course, chocolate also is very bad and even deadly for dogs.
Chicken skin is very bad as well. Feeding lots of people food can cause Pancreatitis which can be fatal if not treated immediately.
NEVER EVER feed cooked bones of any kind to your dogs. Cooked bones will splinter and cause problems such as perforating the intestines/colon or causing blockages.
The grape thing can have an accumulative affect. You may be able to feed your dog a grape here or there on occassion with no adverse reaction....or it could end up building up and that 10th or 12th grape may put your dog over the edge.
Macadamia nuts are also bad for dogs.
Check this site out for a list of toxic plants:
http://www.angel-litemaltese.com/Poison.htm
Also, liquid laundry detergents can cause burns on your dog. A lady had a dog crated within reach of a bottle of Tide, the dog managed to spill it and all the Tide went into the crate, the dog was forced to sit/lie in it and ended up with skin burns.
Dryer sheets can be very dangerous to dogs as well....I'm not sure if it's what is on them if a dog carries one around or eats it, or what, but I know there have been warnings posted about not letting your dogs play with them on the dog forum I belong to.