I can't believe nobody's mentioned the master yet. Get your hands on anything by Heinlein. His early stuff is good if you just want sci-fi or dead on social commentary (Starship Troopers?). His later stuff tended to be a bit different, but still quite readable. The Number of the Beast is an absolute classic.

Others that can be found on my reading list:

• Zen & the Art of Motorcycle Maintenance
• The Red Wheel series by Aleksandr Solzhenitsyn
• Fermat's Enigma
• The Tao of Pooh
• Rather shamefacedly I'll admit to reading the Magic: The Gathering books
• Beowulf

Guildenstern
Negaterd character class uber alles!