I've only read 32 from this list (though several more are already on my shelves, waiting). I take exception to Thomas Convenant, though. I found that to be some of the most depressing, amoral stuff I've ever read. It is all well-constructed, but I certainly did not feel I was sufficiently rewarded for finishing them.
There are so many other people I expected to see on the list, though. Harry Harrison, Christopher Stasheff, Robert Aspirin, Spider Robinson, Robert Silverberg, and let's not forget J. K. Rowling. I'm not sure if the list was compiled solely on popularity, influence, or merely by total respondents (I admit I wanted to submit my votes, but missed the deadline).
--Patrick