So, does the ring always corrupt in a dark lord sort of way, or is Overtaxed more correct when she said that it corrupts according to one's ambition.
By the way, I'm doing the Smeagol Victory Dance - I got 700!
He said.. (I was going to bring the book, but I forgot it... so this is by memory...)
It's a good thing Aragorn never got ahold of the ring. His will is so strong that he could have bent the ring to do his will and become a great and terrible dark lord.
So, it seems the ring is controlled by your will and not your ambition.
Smeagol's will was for fish... so, the ring provided him that.
Then in the next chapter, Gandalf said that destroying the ring was the only way to destroy Sauron. He would not be "destroyed" as in "poof - gone forever", but he could only grovel in shadows and never take power to himself again. The foundation of his fortress was the ring.
In the battle of the palantir, Aragorn was able to convice Sauron that Isildur's heir had the ring. That is why Sauron attacked Gondor.