Among the most elaborate fanfictions i have ever read, this story is a gapfiller that covers events between Frodo's fall at the ford and his waking in rivendell. Warning: some scenes are very graphic
On rec.arts.books.tolkien, there is periodic debate whether the eagles could have flown the Ring into Mordor, saving Frodo and Sam the hazardous journey on foot. Here's an in-depth analysis on the *ahem* feasibility of such a plan.