The Schroedinger's Cat Trilogy
The Baroque Cycle
The Hitchhiker's Guide To The Galaxy
The Hundred Thousand Kingdoms
Brave New World
The Earthsea Series
Signal To Noise
Box Office Poison
I've listed books and comics, because my original list had some comics in it, and then got too long, so I "cheated" and had ten of each. And this is largely a book list from my youth, books that have taken up space in my head for 20 years and not let go. Other than The Hundred Thousand Kingdoms, which I recommended to someone just this afternoon, and you should all read.
Nominating: matgb, wig, dalglir, darkoshi, quirkytizzy, bart_calendar, manintheboat, randomdreams, mountainkiss, and brixtonbrood.
Fuck it, and anyone reading this who hasn't posted in the last three days. Now you have something to post.
Original post on Dreamwidth - there are comments there.