Again, no unifying theme this week, but I think these are some good ones.
The Forever War by Joe Haldeman ($4.99) - This is a classic and worth a read. Here's Alec's Review.
A Madness of Angels by Kate Griffin ($2.99) - Orbit's Digital Drop
Snow in the Desert by Neal Asher (Short stories) ($1.38)
Manhattan in Reverse by Peter F. Hamilton ($4.99)
Girl in the Arena by Lise Haines ($2.99)
Wool (Omnibus, books 1-5) by Hugh Howey ($4.99)
Breakfast of Champions by Kurt Vonnegut ($4.09) - Here's my review, I can't get enough of the Vonnegut.
Shades of Milk and Honey by Mary Robinette Kowal ($2.99)
Agatha H. and the Airship City by Phil and Kaja Foglio (FREE)