In no particular order, i.e. as I remember them.
* Harry Potter and the Order of the Phoenix by J.K. Rowling (reread)
* Harry Potter and the Half-Blood Prince by J.K. Rowling (reread)
* The Horse and his Boy by C.S. Lewis
* Prince Caspian by C.S. Lewis
* A Clockwork Orange by Anthony Burgess
* The Quark and the Jaguar by Murray Gell-Mann
* Maskerade by Terry Pratchett
* Moving Pictures by Terry Pratchett
* Jhereg and Yendi by Steven Brust (as part of the Book of Jhereg omnibus - I'm currently working on Teckla)
* Smoke and Mirrors by Neil Gaiman (short story collection)
...I guess that's it. I really need to get moving. I've also read V for Vendetta and the first volume of Transmetropolitan, but I'm not sure to what degree they "count". Oh, and the fourth Girl Genius collection.
Speaking of comic collections! Howard Tayler, creator of Schlock Mercenary, my favorite webcomic, is now taking preorders on the first Schlock Mercenary collection. Preorder now for $15 and get it autographed, and Howard will put a pen-and-ink sketch in the book for $10 more. Schlock is, in my opinion, easily the best science-fiction comic strip out there. (Admittedly, I have to classify Girl Genius as something other than SF to be able to say "easily" there, but they call themselves "gaslamp fantasy" anyway.) Anyway, if you're not reading it, I suggest you start - and if you are reading it (or even if you're not), I feel quite confident recommending this book, sight unseen. (And Howard and Sandra (who is an integral part of Schlock's existence, even if she's not strictly involved in creating the comic) are trying to feed four kids on income from Schlock. Please, won't someone think of the children? :D)
And for those of you curious about the Scatterplot book, I've embarked upon the next step: transcriptions of the Scatterplot archive, by way of error checking. Ideally, I'd like to see the entire 375-strip archive transcribed, with errors marked, so that I can go and fix those errors in the process of converting Scatterplot to book format. So, if you feel like helping, jump into the archives somewhere and just start transcribing! The archive pages have more information and relevant links.