SF Books People Claim to have Read

Today, io9 wrote a blog about "10 Books you Pretend to Have Read." Looking over the list, I realized that, while I've not pretended to read books that I have not actually read, there were several books out there I do need to read.  Lists like this are a good way to grasp the history of the genre, see what has changed, and what ideas we are still exploring.

So, if you've not read some of these books -- or even if you pretend you have -- let the library help you make up for it.  Many of these books are in the library system, and those that aren't can be found through our Interlibrary Loan program.  

Are there other books not on this list that you think people claim to have read when they haven't?