2012 Hugo Award nominees for Best Novella
"The Ice Owl", Carolyn Ives Gilman (F&SF 11-12/11)
"Countdown", Mira Grant (Orbit Short Fiction)
"The Man Who Bridged the Mist", Kij Johnson (Asimov’s 10-11/11)
"Kiss Me Twice", Mary Robinette Kowal (Asimov’s 6/11)
"The Man Who Ended History: A Documentary", Ken Liu (Panverse Three)
Silently and Very Fast, Catherynne M. Valente (WSFA)
2011 Hugo Award nominees for Best Novella
The Lifecycle of Software Objects, Ted Chiang (Subterranean)
"The Maiden Flight of McCauley's Bellerophon", Elizabeth Hand (Stories)
"The Sultan of the Clouds", Geoffrey A. Landis (Asimov’s 9/10)
"Troika", Alastair Reynolds (Godlike Machines)
"The Lady Who Plucked Red Flowers beneath the Queen's Window", Rachel Swirsky (Subterranean Summer 2010)
2010 Hugo Award nominees for Best Novella
"Act One", Nancy Kress (Asimov's 3/09)
The God Engines, John Scalzi (Subterranean)
"Palimpsest", Charles Stross (Wireless)
Shambling Towards Hiroshima, James Morrow (Tachyon)
"Vishnu at the Cat Circus", Ian McDonald (Cyberabad Days)
The Women of Nell Gwynne's, Kage Baker (Subterranean)
2009 Hugo Award nominees for Best Novella
"The Erdmann Nexus", Nancy Kress (Asimov's Oct/Nov 2008)
"The Political Prisoner", Charles Coleman Finlay (F&SF Aug 2008)
"The Tear", Ian McDonald (Galactic Empires)
"True Names", Benjamin Rosenbaum & Cory Doctorow (Fast Forward 2)
"Truth", Robert Reed (Asimov's Oct/Nov 2008)
"The Fountain of Age", Nancy Kress
"Recovering Apollo 8", Kristine Kathryn Rusch
"Stars Seen Through Stone", Lucius Shepard
"All Seated on the Ground", Connie Willis
"Memorare", Gene Wolfe
Of this list, I've only read the Connie Willis novella. I thought "All Seated on the Ground" was entertaining but somewhat lightweight reading.
"A Billion Eves", Robert Reed (Asimov's Oct/Nov 2006)
"Inclination", William Shunn (Asimov's Apr/May 2006)
Julian: A Christmas Story, Robert Charles Wilson (PS Publishing)
"Lord Weary's Empire", Michael Swanwick (Asimov's Dec 2006)
"The Walls of the Universe", Paul Melko (Asimov's Apr/May 2006)
