It drives me a little nuts when people use the phrase "would of" [but probably not nearly as much as when I hear "could care less" (see my first post... http://grammarguidelines.blogspot.com/search/label/Could%20Care%20Less)]. What they really mean when they say "would of" is "would have."
I realize habits are hard to break. That's why people should think carefully before they speak. If they do, they will reduce the likelihood of misspeaking. It is embarrassing to make mistakes when speaking to someone, particularly if they are intelligent. And yes, I do make mistakes when speaking. When writing, not so much--that is editable. Sometimes, though, you don't even realize what you are saying because it is something that you've heard your entire life.
For me, I tend to say "sump'n" instead of "something." Maybe it's a Southern thing like "ain't." Of course, I don't write it that way and never even realized I said it that way until my husband pointed it out. He thinks it is endearing. However, that is not a mistake I want to make when I am conversing with an intelligent person.
Incorrect: would of
Correct: would have
Introduction to Grammar Guidelines
With texting, Facebook, and Twitter fast becoming main modes of communication, the new shorthand lingo that is developing will no doubt bring about a higher frequency of grammatical, spelling, and punctuation errors. The rules that define proper English seem to fade into the distance as more people forget them and replace that knowledge with acronyms such as OMG and LOL. The hope for this site is to reinforce proper English grammar and continue to encourage eloquent writing and speech.