Little Brother - Doctorow, Cory (Tor, Apr08)
Powers - Le Guin, Ursula K. (Harcourt, Sep07)
Cauldron - McDevitt, Jack (Ace, Nov07)
Brasyl - McDonald, Ian (Pyr, May07)
Making Money - Pratchett, Terry (Harper, Sep07)
Superpowers - Schwartz, David J. (Three Rivers Press, Jun08)

Check 'em out on the Nebula page.