DO inquire about gift protocol. Some companies have very strict guidelines regarding gift acceptance. To avoid troubling your intended gift recipient, a discreet call to the secretary or receptionist to ask about the company's gift policy should give you the information you need. DON'T send a group gift unless everyone knows each other. DO check vigorously for mistakes in personalized gifts.
Nothing is more disappointing than a misspelled item.
DON'T reciprocate automatically. If a person sends you a gift, there is no need to give in return. But do make sure to acknowledge the gift and thank the giver for his or her thoughtfulness. DO be judicious in your choice of charities. Make sure the charity won't offend.