The more I get involved with a SEO project, the more and more I find myself feeling pissed off at my competition for beating me to article submissions, or using techniques that I feel are slightly unethical, or... you fill in the blank. I'm constantly wanted to turn in their spammy backlinks and stupid forum posts etc... But that would just start an all-out war... How does the average SEO expert deal with this? Is it an unspoken rule that everyone plays nice? How often are your links or whatever attacked by an adversary?