I love non-fiction too. Especially natual history or travel writing.

I'm reading Animals in Translation by Temple Grandin (an autistic woman who was featured in one of Oliver Sacks' books.) It attempts to explain how animals think and why they act the way they do. Very interesting.

Some of my favorite non-fiction books:
A Natural History of the Senses by Diane Ackerman;
Teaching a Stone to Talk by Annie Dillard (both essay-type books);
The Happy Isles of Oceania by Paul Theroux (travel essay by kayak)
Songlines or In Patagonia by Bruce Chatwin (fictionalized non-fiction)
Tracks by Robyn Davidson (travel essay about a solo trip with camel across Australia)
A Short Walk in the Hindu Kush by Eric Newby (mountaineering in Afghanistan-- very harrowing story)

I can't wait to hear about more good non-fiction books to add to my list!