Nobody wants to talk about Vonnegut's pessimism or political outrage about the war in Iraq and our consumption of oil and global warming. The New York Times includes his poem Requiem, but not the context. The context is that the human race is killing itself and its planet, and doing so because it is shortsighted and stupid and cares more about sports and sky-god myths than it does about the importance of reality. We're monkeys who refuse to use our gift of intelligence.
The best way to honor Vonnegut is not to whine about how much Cat's Cradle meant to you but to fight for the things that mattered to him. To try and care for your fellow human beings and mankind as a species and to try to keep the world livable for his grandkids.
If you can't do that, well, then at least try, even if only for a day, to be kind. THAT'S what he would have wanted.