[Boromir88]

Ring are overpowering the little bit of good that remains, which calls itself Sméagol. Something about this latter intepretation seems more robust somehow.~lmp

Interesting, I like that interpretation. And davem talking about Frodo's 'writhing' reminded me of Boromir's own struggle with the Ring. And I think Boromir's situation is much like Gollum's, only Boromir's impulses are a bit different.

As Faramir points out, Boromir's character is what made him susceptible to the Ring:

'I can well believe that Boromir, the proud and fearless, often rash, ever anxious for the victory of Minas Tirith (and his own glory therein), might desire such a thing and be allured by it.'~The Window on the West

And we see right from the start (The Council of Elrond) Boromir's impulse to use the Ring as a weapon against Sauron, and have a 'great victory' of Sauron by using his own weapon. However, this is shot down by everyone at the Council (as they all know better). And we see Boromir struggle with what he desires and that he was told 'no,' the Council had chosen a different path:

Boromir got up and walked about impatiently. 'So you go on,' he cried. 'Gandalf, Elrond - all these folk have taught you to say so. For themselves they may be right. These elves and half-elves and wizards, they would come to grief perhaps. Yet often I doubt if they are wise and not merely timid. But each to his own kind...'~The Breaking of the Fellowship

We see Boromir struggle with what he wants to use the Ring for, and what he was told by all the 'wise' at the Council, up until his very fall to the Ring.

So, I have to say that the Ring doesn't 'create' any evil within the person (as I agree with lmp that's the impression we are left with by the movies..."poor sick hobbit, he's really nice and it's all the Ring's fault".- posted by lmp) , the evil impulses are already there, and the Ring tries to use that impulse within everyone to it's own advantage. The Ring doesn't create any impulse, it uses what's already in the individual.

Tolkien says in Letter 246 that the bearers of the Elven Ring considered using the Ring as a weapon (just like Boromir wanted), yet they decided it was wiser not to. And we see with Galadriel 'passing the test' this very desire...Galadriel was able to reject her own impulses. While others like Boromir and Gollum could not do so, either the Ring was too strong for them, or they themselves were too weak.