Help NPR choose the top 100 F/SF novels ever written

You probably have seen this on the Internets, but NPR is asking for nominations for best F/SF novels ever written–and you can nominate a series. (you can nominate up to 5 books/series)
My own personal list, that I submitted, looked like this:
Chronicles of Amber, Roger Zelazny
Dune, Frank Herbert
The Dying Earth, Jack Vance
Ringworld, Larry Niven
The Vorkosigan Saga, Lois Bujold
Go nominate your own favorites!
http://www.npr.org/2011/06/20/137249678/best-science-fiction-fantasy-books-you-tell-us