Just finished reading "Blindsight" a book released for free under the creative commons licence. It's a very interesting, hard science fiction novel. Which explores a number of interesting ideas, related too intelligence, consiousness and they way our minds work. If your interested in that sort of thing or just good Science fiction I highly recomend you read the Book. The link is to the online copy and also links to PDF and zipped HTML versions.
Blindsight by Peter Watts
The ideas with regards to sentience and Intelligence and if both are required, for a advanced or high tech species are very interesting.
So read the book and let me know what you think!
A few examples of some of the things mentioned or discussed in the book can be found here.