I can't believe I didn't find this thread earlier. Books are great!
I've been reading through the Space Trilogy by C.S. Lewis - first book is so-so, but the second (Perlandra) is awesome. I think the third will be good too.
Also, just got the Suma Theologia for my birthday - that will be an interesting read.
For little known books, Sylvie and Bruno by Lewis Carrol is an interesting read.
And for a good non-fiction book, try The Silent World by Jaques Cousteau. It talks about how he invented the aqualung in wartime France, and different adventures he had with it. The Living Sea is another good one by him.