While it is important to focus on products to sell on Amazon, it is also important to pay attention to which products you should not sell. These products are ones which the manufacturers will give you a difficult time if you are trying to sell on Amazon.
Dunkin Donuts Coffee
Dr Dre headphones
Rosetta Stone software
Warner Brothers movies
From the conditions guidelines, you also need to avoid the following items:
Drafts and proofs for books
Any item that is or is suspected to be counterfeit or fake
I will add to this list as I receive additional information.