Are these the 100 greatest SF novels?

Floating around on various blogs were links to this site, with its list of what it considers the 100 greatest SF novels. It's certainly an interesting list, and one I think can be argued with (probably vehemently over a hot panel at an Eastercon).

However, I'm a tad worried. I seem to have read 81 or so of them...

But I haven't read Slan.