The 21st edition of the award-winning annual compilation of the year's best science fiction stories.

Winner of a 2008 Hugo Award, this new paperback takes readers on spectacular tour of the language created by science fiction. From "Stargate" to "Force Field," this dictionary opens a fascinating window into an entire genre, through the words invented by science fiction's most talented writers, critics, and fans. Each entry includes numerous citations of the word's usage, from the earliest known appearance forward. Drawn not only from science fiction novels and stories, citations also come from fanzines, screenplays, comics, songs, and the Internet.

The past through tomorrow are boldly imagined and reinvented in the twenty-five stories collected in this showcase anthology. Many of the field's finest practitioners are represented here, along with stories from promising newcomers, including: William Barton * Rob Chilson * Tony Daniel * Cory Doctorow * Jim Grimsley * Gwyneth Jones * Chris Lawson * Ian McDonald * Robert Reed * William Browning Spencer * Allen Steele * Michael Swanwick * Howard Waldrop * Cherry Wilder * Liz Williams A useful list of honorable mentions and Dozois's insightful summation of the year in sf round out this anthology, making it indispensable for anyone interested in SF today.

This second anthology of the best of Australian SF Review includes pieces by Gregory Benford, Janeen Webb, Lucius Shepard, Jenny Blackford, George Turner, Yvonne Rousseau, Douglas Barbour, and others--writing about Watchmen, cyberpunk, steampunk, Philip K. Dick, Ursula K. Le Guin, Kim Stanley Robinson, and Lucius Shepard. Complete with introduction, bibliography, and index.

Sweeping through the Small Magellanic Cloud, leaving a trail of ravished worlds and destroyed civilization, is the Udef -- the Unidentified Death Force. The best scientific minds of two galaxies can make nothing of it. The Udef is invisible. No scientific instrument can detect its presence. The only marks of its passing are the screams of its victims and the piles of dead left in its wake. Momentarily safe on the world of Montura, Jan Darzek's strategy against the Udeffalters. He and his assistant Effie have been ordered there by a supreme computer -- that isn't telling why. There is nothing to do on Montura but frantically wheel and deal in its spectacular interworld trading market. Supreme has also sent a perplexed Dr. Malina Darr from Earth, whose apparent purpose is to cure an unknown disease in an alien life form no one has ever seen ... The three of them must content with a mad mixture of Montura's mysterious race of natives, the melange of self-serving life forms in the marketplace, and the Kloatraz -- the universe's strangest "living" computer -- while the Udef comes ever closer to wiping out every intelligent life form in the universe. Somehow it must be stopped before no one is left to fight it.

Science fiction's premier editor assembles the best stories of the year from veterans and newcomers alike, including Alan Brennert, Gwyneth Jones, James Patrick Kelly, Nancy Kress, Paul J. McAuley, Robert Silverberg, and many others.