Book: Warbreaker
Author: Brandon Sanderson
Where to download: author's homepage
Direct Links: Warbreaker [pdf] (final hardcover version)
Other versions (PRC recommended; convert to other formats like epub with Calibre)

Warbreaker is a stand alone fantasy novel by Brandon Sanderson (Mistborn Trilogy, Elantris, final Wheel of Time books) that features a unique magic system. I haven't read it yet, but given that I have liked some of his other works so far, I don't believe you can go wrong with this novel.

It was released as hardcover by Tor Books and was also published on the author's website for free in electronic format (Creative Commons license). You can also compare various versions and previous iterations of the novel if you feel inclined to do so and want to see how it was developed.