How has nobody listed the Secret Diaries of Adrian Mole? You can't know how those saved me from all kinds of Sweet Valley
Horrors.
I'm also a bit put off that my very, very favorite book of all time has been neglected here. Saint-Exupery's The Little Prince. Beautiful work. His aviation novels are nearly as lovely, too.
Also, if anyone from New Zealand reads this, do they still print Charlie the Cheeky Kia and then there was one about a Captain Cook pig that we lost in Hurricane Katrina. They were two of my favorite books as a child after my grandparents brought them back from NZ (granddad was a bird enthusiast) and I've never been able to find them since. If any of you find a copy and have paypal/e-bay I'd certainly shell out for it.