I've self-published a novel on Amazon. Hegemony is a space opera with a hard-sci-fi edge and some transhumanist themes.
My readers to date seem to have liked it. It's available for 99 cents on Amazon.
If you're interested in a hard sci-fi story with intrigue and space battles, you might want to check it out.
It's available at
http://www.amazon.com/Hegemony-ebook...5206194&sr=8-1