[Airehiriel]

It is my impression that Sam would have taken the ring all the way to the Cracks of Mt. Doom, and that he would have accomplished what Frodo could not. The one thing that amazed me most was that Sam handed the ring back to Frodo with no apparent fight. I think Sam was so preoccupied with Frodo and every thing and one back in the Shire that it would have allowed him to conquer.
Either that, or he would have died trying, which really would have been a bad thing.