It's true that rules for grammar and punctuation sometimes change, through common usage, but let's not accelerate this process by proliferating incorrect usage!

In your section on grammar, you state: A huge topic of contention between editors is the usage of “that” as opposed to “which”. I believe that if the sentence you are using these words in sounds better when you separate them by a comma, always go with “which”. You would be more correct in stating your comment like this: "I believe that if a sentence in which you are using these words sounds better when you separate them with a comma, always use, "which."

In the section on punctuation, you wrote: Another huge common punctuation error is using “they’re” instead of “their”. “They’re” should only be used when you are referencing something that more than one person is doing, for example: “They’re the only football players that never allowed for one touchdown the entire season.” Here, you should have pointed out that, "they're," is a contraction of the words, "they are." Also, your example is grammatically incorrect. It should read, "They're the only football players who never allowed one touchdown for the entire season."

I would also suggest trying to avoid over-usage of adjectives such as, "huge." You could have stated this idea more succinctly, like this: "Another frequent punctuation error is substituting, "they're," for, "their." Please note that words set in quotation marks within a sentence should be preceded by a comma.

Hate to point this out but..

You just did what you told us not to do.

"For example, when you are using “affect” as opposed to “affect”,"

I guess incorrect grammar gets us all sometimes.

;o)

That's my take on things. Of course we should bother with correct grammar and spelling as best as we can, and for that, your post contains excellent tips.

For example, when you are using “affect” as opposed to “affect”

I think you committed one of your own essential mistakes to avoid =)

You do make a good point though.