Comment Re:Skeptical (Score 4, Informative) 157
There's more detail on the hunt for gollum in Unfinished Tales. Still not a lot, to be honest.
The most interesting thing is the explanation of how Gollum escapes from Thranduil. Basically, Sauron had been unable to completely break Gollum - perhaps because of Gollum's hobbit heritage. So Sauron had let Gollum go, in the hope that Gollum would find his way to the Shire or Baggins - both names Sauron had got out of him, but both things Gollum didn't know the location of. So Sauron let Gollum go, but kept an eye on him.
Then Aragorn captured Gollum, just outside Mordor. Now, Sauron knew (from Gollum) that the One had been found, but he did not realise anyone else knew this. So he was now worried that Gollum's new captors would discover this information, and thus Sauron would lose an advantage. Hence he arranged for an orc-raid to capture or kill Gollum. However, Gollum escaped. There were also Nazgul in the area, searching for the Shire in the guise of black riders, so in terror of the orcs and the black riders, Gollum hid in Moria./p.