This massive tome is an omnibus of two separate anthologies (The Good Old Stuff, and The Good New Stuff, both edited by Gardner R. Dozois). Some standouts are:
"The Rull" by A.E. van Vogt;
"The Galton Whistle" by L. Sprague de Camp;
"That Share of Glory" by C.M. Kornbluth;
"The Sky People" by Poul Anderson;
"The Man in the Mailbag" by Gordon R. Dickson;
"Moon Duel" by Fritz Leiber;
"The Doors of His Face, the Lamps of His Mouth" by Roger Zelazny;
"Goodbye, Robinson Crusoe" by John Varley;
"The Blabber" by Vernor Vinge;
"The Return of the Kangaroo Rex" by Janet Kagan;
"Poles Apart" by G. David Nordley;
"Flowering Mandrake" by George Turner;
"Cilia-of-Gold" by Stephen Baxter;
"A Dry, Quiet War" by Tony Daniel;
"Escape Route" by Peter F. Hamilton.
