I love travel books, the more extreme the better, so anything by Redmond O'Hanlon is usually a great read. He's a crazy guy from Oxford who visits the most hostile natural places on earth and tries to explore like someone back in the 1800's used to. Congo Journey is a good example, and worth buying.

John King writes some good stuff too, though it's usually a very "English" read. I just finished "White Trash" by him, and it's on par with the others "Football Factory", etc.

If you want to be put off sex for life, try anything by Peter Sotos. He writes about sex exclusively, but seems to hate it with a deep passion. He's almost a DeSade for the modern age. Brutal stuff.

I don't read that much, but when I do it's usually stuff about:
Anything by Stephen Hawking
Astronomy/Astro physics
Tattoo History
Anything by or about Jack Herer
Groundbreaking physics/gadgets
Stephen King
J.R.R.Tolkien (obviously :) )
i have been reading sci fi books lately:
A Case of Conscience by James Blish
The City and the Stars by Arthur C. Clarke
presently reading:
Anibus Gate by Tim Powers
i would also recommend:
Enders Game by Orson Scott Card
Songs of Earth and Power by Greg Bear
Lathe of Heaven by Ursela Le Guin
Coraline by Neil Gaiman
et cetera, et cetera