In contrast to using the acronym IMO (in my opinion) or IMHO (in my humble opinion), I am advocating a more confident approach to discussion and debate. I believe certain folks who have no doubt that their opinions are beyond anyone's ability to disagree should adopt the following acronym: OMOIV, which stands for Only My Opinion Is Valid. End every paragraph with that acronym, and no one will bother arguing with you, and you can rest assured that you are absolutely right about everything you say.
Gosh, see how accommodating I am? I always want to help everyone! I want even those who lack humble opinions to be able to express their true feelings uninhibited, and with as few keystrokes as possible :)