10/1/2008: Gather Specimens isn't targeted. It affects creatures that would enter the battlefield under any opponent's control.
10/1/2008: Gather Specimens affects both token creatures and nontoken creatures. It affects creatures that would enter the battlefield by any means. This includes, of course, creature spells that resolve. It also includes creatures put onto the battlefield as a result of a resolving spell (such as Call of the Herd or Zombify), resolving ability (such as Verdant Force's ability or Doomed Necromancer's ability), cost (such as Varchild's War-Riders's cumulative upkeep cost), replacement effect (such as the one created by Words of Wilding), or any other means.