I

I and ME
Wrong: Please join the Reverend and I in praying for your rotten souls.
Correct: Please join the Reverend and me in praying for your rotten souls.
Tip: Join me, not I.

IN THE $90 RANGE
Wrong: These shoes are in the $90 range.
Correct: These shoes are in the $90 to $110 range.
Tip: A range requires two numbers.

IRREGARDLESS
Wrong: This word is right, irregardless of what the spelling checker says.
Correct: This word is right, regardless of what the spelling checker says.
Tip: The prefix "ir" means "not" in this instance.