I love non-fiction, it’s all I can stand to read anymore! Beware: once you start reading non-fiction, you might not be able to turn back.
The Tipping Point by Malcolm Gladwell. A pretty popular book, so you might’ve heard of it. It’s about fads/trends and how they catch on. Sounds boring, maybe. But it’s really well-written and well-thought out and it really makes a lot of damn sense. Gladwell also recently released a new book called Blink that looks pretty good too.
Hurricane Watch by Bob Sheets (former director of the NHC), about the history of hurricane forecasting and hurricane dynamics. Or Storm of the Century by Willie Drye, about the Labor Day hurricane (1935) in the Florida Keys. It gets into the politics of the situation a little bit too, which reminds me of some of the finger-pointing that’s going on with Katrina.
The Hot Zone by Richard Preston, about the Marburg virus (think Ebola) - VERY creepy and a very quick read. You can finish this in under a week and then get started on the twickster’s Dodo book (which I just added to my wish list :)). This was recommended in a SDMB book thread.
An African in Greenland by Tete-Michel Kpomassie (whew, had to cut and paste that one), about an African guy who is determined to explore the world, spends 7 years getting to Greenland and this is about his experience. It’s a little dry at times, but a good read. This was also recommended by a doper.
If you haven’t read In Cold Blood (Capote) or Helter Skelter yet, get on it. Those are two of my favorite books ever. I’m a true crime junkie too.
The Man Who Mistook His Wife for a Hat by Oliver Sacks - stories about interesting cases of mental disorders - gets a little technical sometimes, but some of these stories are just unbelievable!
Other stuff in my list that I haven’t read yet (so they might not count):
**Salt: A World History **by Mark Kurlansky
Air Apparent : How Meteorologists Learned to Map, Predict, and Dramatize Weather by Mark Monmonier (I like weather, okay)
A People’s History of the US by Howard Zinn
Last Train to Paradise by Les Standiford (about the construction of the Florida East Coast Railway in the Keys, also has some details about the Labor Day 1935 'cane - that was the end of the railway)
Rats : Observations on the History and Habitat of the City’s Most Unwanted Inhabitants by Robert Sullivan
Blue Latitudes is in this list too after it was highly recommended by a doper in another thread - probably twickster. I found it on sale. 
I second Cuckoorex’s recommendation for Stiff, unless you have a weak stomach, I mean. In which case, you probably shouldn’t read The Hot Zone either.
Phew, all this coding has done me in!